I feel that jump shot, 1-on-1, passing, and pressure all train extremely fast regardless of height. I've also recently learned passing trains faster for taller players than it is smaller players too (though it's so fast to train for everyone that this is trivial information). I think height is mostly irrelevant for guards. The general premise is definitely the smaller the better, though.
I'd personally draft the player (guard or big man) you consider to be best, which is usually the player with the highest potential and skills. There's so little margin for error in the draft.