My favourite: I LOVE bard so much. Something about my goofy outfit with my flute is just entertaining to me. My second favourite would probably have to be Druid or cleric though. I love wild shaping, but light cleric is also insane.
My least favourite: I hate Barbarian. I just find it so boring. Don’t get me wrong I like the starting drip, but it’s just not for me.
Favorite is Wizard, always and forever. It doesn't work great as a face class but I love teaching Gale every spell scroll we get. Toolbox of a class. I also make him a divination/counterspell king so he can blow stuff up AND protect his buddies.
Least favorite is Ranger. It might be a prejudice from playing tabletop 5e and the fact that I never dabble in it until I get Minsc and by then everyone else is so optimized and kitted out that it feels extremely underwhelming.