Clerics for sure. Always where my mind starts to go if I haven't locked down a concept yet. Having the whole spell list to choose from and prepare at the start of the day feels so good, even at lower levels, and then you get all the goodies from the Subclass out of the gate too, never feels like you have a full level. And if you don't want to be tied to a god, following an ideal or concept like 5e suggests works for so many ways and still gives an easy investment or motivation for a charcter.

Mercer's updated Blood Hunter is the only homebrew class I've personally played, had a lot of fun with the choices available to the Mutant subclass. I've DM'd for a buddy playing a Justicar/Maledictor twice and he's enjoyed that take on a half caster/half martial a lot too.

Just recently into level 2, but my current character is an artificer who escaped a Cult of Magic Worshipers who would have nothing to do with technology. Character also has some inspirations from Icarus, so he's working on his own pair of wings!