What are the most common kinds of frets you can set up on a fretboard (jumbo, and...2 others I think...). What's the difference among them? And if i play flatwound strigs would a particular kind of fret be more useful than another? None the least: does the difference amongst theese kinds of frets influence the bass playability on the fretboard?
T'nqu! :hyper:

Yes, frets effect things quite a bit in my opinion. I tend to like smaller/skinny frets on my guitars. It's personal preference........try out different guitars/basses with different sized frets and FEEL for yourself! Some luthiers even use like mandolin frets on smaller scale basses........
if you play it, and like it, and it feels good, then do it.