I believe the role means nothing in draft.
Sometimes it happens to find SG with no OD... and you can't tell me that's a SG.
When I have to choose I just look at:
1) age (19 years old are way less attractive than 18yrs)
2) Skills (5-4 balls are ok. 3 balls only if the potential is high)
3) potential (4-5 balls are great, 3 balls is ok, 2 balls and under no way)
4) height (this is the last one because i usually sell my rookies just to buy one on the market with the right combination of skill\height\potential).
Anyway, I'd go with A B C D, but don't expect anyone of them to be a steal.