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Fire and Water were always my favorites growing up as I typically picked them before Grass. Over the time I've become fond of grass types as well. They have the biggest variety imo as to what they're based off of.
Bug and Ghost have the strongest and creative designs imo. I also like Dragon and Fairy types(Clefable is one of my favorite pokemon) alot and I feel Fairy has tons of potential for moves.
Least is probably Rock and over the years Electric. Former doesn't have any that wow me outside of a few and the latter is pretty predictable.
Ground, Fighting and Dark are pretty good gameplay wise with Bug being the weakest gameplay wise.
As for types, I think we're good for now. But if another type like wind or slime were added I wouldn't mind.