All are good, but OTB and live are slight favorites.

OTB is the best...there is nothing like a real board and real pieces and an opponent seated three feet away...but Live Chess is just so convenient, and it is great to play people from all over the world.

I don't play turn-based online.  I like to get my games over and done with.  On the other hand, I play chess variants almost exclusively using turn-based online.   For some reason I like taking more time on chess variants than I do on regular chess.  I have no idea why.

Amy

both are quite enjoyable...and have their advantages!!