This thread is particularly interesting to me, because I also had to choose a SF between these three guys and one other player. I ended up choosing the other guy, obviously. But, I agonized over the decision, and wish I would have waited to see what everyone says here. Of course, then we might have got ourselves into a battle over one of these guys.
So, that said, how about you just sign all three? That way I can follow each for the next four years and determine if I made the wrong decision.
FWIW, I had some concerns over #2's FT shooting and passing, and that was ultimately the reason I didn't go for him. Of course, passing may be more of a priority in a Flex offense than Fastbreak. For ethical reasons, I'll refrain from giving any more opinions since I'm not exactly an unbiased third party here.
But, good luck with the decision. All of these guys will be really solid players.