I'll just boldly split that answer into some categories :D
Black teas:
As my personal favorite I prefer Darjeeling teas, because of their flowery and mild taste.
As for my daily driver I mostly find myself drinking stronger black teas, like english breakfast or ceylon teas.
Green teas:
My personal favorite for green tea is the Japanese Gyokuro, because of its strongly present umami flavour and general taste.
This green tea gets its flavour from being hidden from the sun by huge black tarps some months prior to harvest. This procedure stops bitter substances from forming within the flower.
But because Gyokuro is a very pricey tea I find myself buying a Chinese green tea called Pi Lo Chun. It's nothing like the Gyokuro that I love, but it has a flowery flavour to it.
I also love drinking and preparing Matcha.
You shouldn't waste money on cheap Matcha, only if you like to drink Matcha Latte.
Whites:
For white teas I love to drink a tea called Pai Mu Tan (sometimes called Bai Mu Dan). It tastes somewhat fruity sometimes.
I've also tried a more expensive white tea called Silver Needles but I couldn't really make out a difference to other white teas I've tasted. But that might also just be an error of mine.
Oolong:
I really like Da Hong Pao.
I haven't tasted many other oolongs.
Yellow teas:
It's been a while since I've had my last yellow tea, but I remember buying a Yinzhen. It had a malty taste, that I really enjoyed.
Pu-Erh:
I like the earthy taste of a good Shu Pu-Erh.
Riper Shu Pu-Erh might even taste like chocolate.
But when first drinking a Shu you might connect the taste and the smell to fish or algae.
Sheng Pu-Erh is more like a conventional green tea.
With time passing, this tea will ripen and unlock new flavours.
I prefer Shengs over Shus.
Misc.:
When talking about other kinds of tea I like substituting coffee with yerba mate. It keeps you energized longer and when drinking it correctly you can also drink it for quite a long time. My longest session was about 4 hours long before the taste vanished.
I'm no huge herbal tea guy, but I do like my camomile tea in the evening to calm myself.
I live in a hot climate so my favorite teas are iced.
Iced oolong sweetened only with some lychee chunks is the only thing close to boba I can stomach. I also like a good iced jasmine green tea. Or just a strong green tea hot or iced.
Green, don't really care about specifics and I have tried dozens of boutique varieties. There is a variety called "gunpowder" that is fairly robust, I like it. My daily driver is Bigelow with pomegranate. Usually straight but sometimes I use local honey.
I'm a big fan of black teas as they have the strongest flavor in my opinion. I'm also partial to the fruity versions.
However, there's a Saffron Black Tea made by Vahdam that I've been rather fond of lately. It has a savory spice to it. Would recommend.
My go-to hot tea is Twining’s Irish Breakfast, stronger flavor than your typical English Breakfast. I prefer it with half-and-half and sugar, but can go with full cream or milk depending on what’s available.
As a southerner, I also like sweet iced tea (“sweet tea”) but was shocked to find what they serve at Chipotle is my favorite. It turns out the tea they use (S&D iced tea blend) comes from a provider in Concord, NC (just outside Charlotte) and they used to sell it for people to brew at home as well, but the company was bought out and don’t anymore. After some trial and error I discovered the secret was to put about half as much sugar in as I normally would. The tea blend itself is excellent, though, much better than you find in grocery stores.
Spicy chai with a touch of vanilla flavoured oat milk, I have 2 cups a day at least.
I used to mostly drink regular tea, and also enjoy earl grey, and especially if I'm not feeling well and want to avoid caffeine - jasmine (probably my favourite non-tea tea), chamomile, mint, and a few others, but the chai has beaten all others and become my staple.
My wife and I have been experimenting with making our own. So far, my favorite is chamomile, lemon balm, elderberry, and a little stevia.
I tried a new one last night that might take the lead with some tweaking: nettle, lemon balm, ginger, and cinnamon. Gotta get the proportions right, but the combination was pretty good.
I enjoy anise-fennel-caraway tea. It doesn't taste as watery as many of the fruit-based teas and not as bitter as black tea and such. I find, it's also decent at clearing out my throat.
Peppermint tea is second place for me, for very much the same reasons. 🙃
Pu'er (fermented black tea sold in big solid disks or chunks) it's nice and dark, reminds me of coffee. I also enjoy iron goddess(Tieguanyin) oolongs and white peony.
I've tried a great many different black and green teas, but my favorite is Constant Comment. I realize that makes me a barbarian low-life, but I genuinely enjoy the flavor.
Sadly, just can't stand the stuff anymore. Grew up having sweetened iced tea for dinner every night. My wife always keeps different varieties on hand and I've occasionally tried different combinations of hot and sweet and milky. For my money, nothing touches a cup of joe. Give it to me black and bitter, like Dick Cheney's original heart.
Sweet Tea. The Southern US kind, black tea brewed with more and more sugar until, ideally, it’s actually a supersaturated solution. Then served cold over ice. Literal diabetes juice.
I don’t have it often, but it’s the best tea in the world because, on the whole, tea is garbage water.
The local Polish grocery store has a selection of eastern European herbal teas, herbs which I'd never heard of, and it's such an interesting experience in tea. One is a type of moss and it makes such pale tea, it's so unusual. I'm loving trying them all.
I also love lemongrass spearmint tea, and rooibos and honey bush teas from South Africa which a friend sends me.
Early Grey man myself but there is a Hawaiian Cocktail tea that has dried pineapple and other tropical fruits that is absolutely exquisite. I’m not usually a fruit tea person as I love bitters. Wish I knew who made it but we’ve had it for quite some time and I don’t.
This is how we drank tea in communist Poland when I was a child and I tried so many teas in Japan with the nice ceremony, Chinese green tea, american peach ice tea, English tea with milk, etc. But nothing comes close.
Sencha Fukujyu. Loose leaf green tea with no added stuff. 70 degrees. Reuse leafs throughout the day. Brewed in a kettle that allows proper expansion of leafs.
I know everyone goes on about Yorkshire Tea and sure I like it too, but I've been drinking PG Tips several times a day for my entire life, and I love it.
Please try August Uncommon Teas. August.la is the link. I raved about them to a friend who honestly became annoyed with me going on about them. Then, tried them. She called me and was like, "Oh, shit. Nico was right."
my favorite switches all the time. currently obsessed w chamomile, thai assam, hojicha (roasted green), and also earl gray! tho we make london fogs w lavendar mostly
Kenya Black or Irish Breakfast with full fat oat milk in the mornings
Vanilla Spiced chai with a cinnamon stick, cardamom pods and star anise during the holidays
Russian orange tea on a crisp winter’s day
Growing up in the south, at some point in my 20s I realized I just didn’t really enjoy overly sugared black tea. And then I discovered a whole new world. It’s been a wonderful journey.
I love green tea. I'm not sure if there's specific kinds I prefer as I haven't tried a lot of different teas, but I have a Sencha Lime Green Tea that is amazing.