I could see that debate going either way. Exum can play 1 or 2, but what if he doesn't thrive w/ PnR as much as he needs to under Snyder, doesn't that make him a 2? Exum & Burks are both 6'6" w/ 6'10" wingspans who excel at getting to the rack, but struggle w/ shooting. Burks has higher FT% than Exum as well. Not saying they're same player at all, but they do share some similar qualities if Exum is forced to be a 2.
Also, if Exum is a 2, then his shot becomes more important, and when you couple that w/ his lack of defensive instincts/ knowledge, he can seem less appealing. We'd have Hayward, Burks, and Exum at the 2, all of which who can create for others, but none of which who can shoot.
Have to make absolutely certain Snyder is confident he can teach Exum to run PnR's w/ the best of them, or else...
That's when A. Gordon starts to look really attractive, especially if you believe his shot is already improving (which is what has been said by those who've seen him workout). As is, Gordon brings a lot of appealing things to a system like the one Snyder is talking about. He plays w/ pace, he defends, he makes the right read, he doesn't stop the ball, he makes great passes, he can be put in the PnR and demand to be guarded w/ his ability to get to the hoop, looks to be able to hit from the outside, can rebound, can lead a fast break, can put the ball on the floor, etc. wing creators are a very rare and valuable thing in the league. He has all the tools to be one. Hayward was in top 7% of wing creators last year (per Locke), so pairing him w/ yet another makes for some very interesting offensive options, especially if Kanter is drawing a big and stretching the floor.
I'll be happy w/ either, but without an up close and personally directed look at Exum, it does make the pick a little scarier. I think both offer enough to at least be serviceable starters, and both have legit star potential. The question is who will make you better and lets you play how you want to play. Exum could be that guy, but his agent is 't giving us the opportunity to peal away some of that mystery.