I was voting Kylington but switched to Hickey. They are about level in terms of upside IMO, but Hickey could win this round
I don't know if Granlund makes it as a centre at NHL level - his role may end up being a decent 2nd line or good 3rd line LW. I put him around Klimchuk's level for that, but what I like about Klimchuk is that so far at every level, he has shown he can play great with good players, which makes me see him as that great complimentary top 6 player beside a guy like Bennett.
Hickey/Kylington
Klimchuk
Granlund
Then I will probably go for McDonald and Andersson