Height doesn't matter in buzzerbeater as much. Although training a taller player is easier to deal with my starting C 6'6". He is 22 know after drafting him in season 12 draft and has 8 shot blocking 10 inside defense/scoring, and 11 in rebounding. I however would go for what you need more.
well, for training purposes size matters A LOT dude. ;-) ingame size means nothing, only the skill-level