Both are actually quite useful when you give them a chance. And I use them on a daily basis with lots of notes, documents, recipes, etc… Reminders for everything, even location based. It really has everything I need, they are ad free and I didn’t have to pay for the apps (besides the price of the iPhone)
With the standard Apple Reminders app, you can link specific email messages to specific reminders, and then link back to the email. Major part of my workflow, and it works across devices.
I share two lists in Reminders with my wife for groceries and things we could do.
My main everything To Do app is OmniFocus, because it's the only app I found that gives me a Deferred option. The idea is to be able to add a task and forget about for it for the time need.
I follow the GTD method and because I use OF to organise all of my projects, I have tons of ToDos and it can be really overwhelming. I used to procrastinate a lot because I hadn't a good view of what I could achieve. So it goes like this :
OmniFocus has some Views. The one I use are Projects, Contexts (or Tags) and Flagged.
The Project View is bloated with all the tasks I have registered.
The Context View allows me to sort my tasks by Capabilities on the moment (A location, a person, a tool, a period in the day etc) and add a first filter on tasks that can be done. For instance I might have a list of ordered tasks in some project that need to be completed one after the other, only the first task of the list will appear here. Tasks that have been deferred won't appear here either.
The Flagged View displays the tasks I flagged, but because there is a deferred option I can flag a task without it actually showing up in my Flagged View. It will automatically show up the moment I decided it should.
You could argue that setting an alarm on a task would basically do the same thing. But the whole point is to decide when I should begin to start doing stuff. Alarms are stressful. I don't need an alarm for a task like "Clean the cat litter" or "Get the trash out". I just need not to forget, because I usually forget those things.
There are a lot of other things I do with OmniFocus, but this comment is long enough already.
I share some Notes too with my wife, but I use Notes mainly for very quick draft. I'll go with IA Writer for longer text, and with Day One for my diary.
Man, Omnifocus (and most of the Omni suite) seems so good, but it's so expensive. I absolutely am not opposed to paying for services, but a $10/mo subscription service or a $50+ app seems crazy for a task tracker.
I was a subscriber until I decided it was way too expensive for a glorified todo list which was really buggy (bad UI, sync problems, etc.) I tried Reminders again and found out that it could do everything I needed for free. I don't care about perspectives which can be replaced with tags, or deferred tasks which can be replaced with deadlines. I'm happy with Reminders actually.