Olynyk because if you look at his advanced stats and per-36 minute stats for his career so far, they really are very good.
16.1 Points
3 Offensive Rebounds
5.6 Defensive Rebounds
8.6 Total Rebounds
2.8 Assists
1.3 Steals
0.8 Blocks
47.1% FG
34.9% 3PT
74.4% FT
+1.79 Offensive Real Plus Minus
+1.71 Defensive Real Plus Minus
+3.5 Overall Real Plus Minus
Offensively versatility is very impressive:
* Ability to score inside (37.9% of his career attempts inside 3 feet, where he shot 66.7%)
* Ability to score from midrange (41.2% FG from 10-16 Feet)
* Ability to score from perimeter (28.1% of career attempts from three, where he shot 34.9%)
* Ability to get to the line (25.8% career Free Throw Rate, and shot 74.4% there)
* Ablity to pass the ball (2.8 Assists Per 36 minutes, 12.7% Assist Percentage)
* Relatively efficient scorer (1.24 PTS Per FGA)
With numbers like that the only areas he's lacking in are:
1) Ability to score on post ups (he gets inside off his dribble / drives
2) Inability to stay on the court due to fouls
If Olynyk can get his fouls down to the point where he can play 32 MPG -34 MPG then what you have is quite literally a poor man's Dirk with supreme offensive versatility - and the NBA is all about versatility these days.
I also love Olynyk's attitude, even if he could use a bit more ego. People mistake his polite personality, his 'finesse' style of play and his lack of brute strength as a lack of mental toughness. Olynyk is not a mentally weak player - he is never afraid to put his body on the line to take a charge right in the chest. He never backed down or gives up when he has a guy 40 pounds heavier than him beating bruising him in the post. He's proven he's not afraid to play through pain (black eye incident). He's proven he's a willing worker (every praised the effort he put in to conditioning prior to last season, and the difference was clear).
Olynyk is not soft, his game just isn't based around a power game.
Sully is skilled no question about it, but his versatility is lacking on both ends of the court at the present time, and I question his motivation to get better. He seems like the type who puts in as many hours as he needs to just to keep himself afloat and to keep himself on the court - doesn't seem like he has that desire to be the best he can possibly be.
I could be wrong, but that's what I see. It's a shame, because I feel like Sully could be a really good player if he truly set his mind to it, but it's been three years now and I've seen no signs to indicate he'll ever do that. A poor man's Vin Baker I think.