I can pretty much enjoy any class I play, but there are certain themes that do come up from time to time.
Rangers - I've liked them since 1e (although 2e's was one of the low points of that edition - the editions were compatible enough we just kept playing 1e rangers). Particularly good version are 1e's, 4e's, PF's, and, yes, 5e's.
Bards - yes, I played a 1e bard and had a blast with him.
Clerics - I really dug into the specialty priests of 2e and I'd like to see more portfolio-based specialties appear for 5e
Druids - also been a big fan since 1e. I always thought they had a particularly interesting spell list.
Monks - my favorite versions are based on Oriental Adventure's martial arts. I really enjoyed building styles and would like to see a modular approach to doing so for 5e.
Paladins - I've played paladins in multiple editions but particularly good ones are PF's and 5e's.
Rogues - I've been enjoying 5e's rogue in particular. Excellent use of bonus actions to make the class play differently from other classes.
Wizards - 5e's wizards are my favorite edition so far