I voted Kolesar for a couple of factors..
1. Improved offensive play last season, could have a bit more upside.
2. he wasn't scoring as much as he did his draft year Bjorkstrand on his line (surprise, surprise). Decided I'll put Kolesar ahead for now and assess Bittner more after his AHL season.
Kolesar:
12-13 = 1 GP, 0 G, 0 A, 0 PTS, 0.00 PPG
13-14 = 60 GP, 2 G, 6 A, 8 PTS, 0.13 PPG
14-15 = 64 GP, 19 G, 19 A, 38 PTS, 0.59 PPG
15-16 = 64 GP, 30 G, 31 A, 61 PTS, 0.95 PPG
Bittner:
12-13 = 45 GP, 12 G, 11 A, 23 PTS, 0.51 PPG
13-14 = 63 GP, 22 G, 27 A, 49 PTS, 0.78 PPG
14-15 = 66 GP, 34 G, 37 A, 71 PTS, 1.08 PPG
15-16 = 25 GP, 10 G, 11 A, 21 PTS, 0.84 PPG
Bittner's PPG were obviously down, but who knows where he would have ended if he played a full season. There is too much that changes during a season to say he would have ended at 0.84 PPG. I still think he has more potential as a goal scorer than Kolesar, but it is a lot closer than it was a couple of years ago.