So Grigorenko I think was a bit quicker in his draft year than Dubois, though I like PL's ability to get out of the corner and to the front of the net with and without the puck a little more. Grig's distribution was excellent, particularly when breaking people down from the right point on the PP or distributing from his forehand. Dubois seems to have more success closer to the net and in the slot, hash-marks in, and goes into those areas more often to create for himself and his linemates. He has more physical play to his game than Grigorenko, though that probably isn't nearly as necessary a defining characteristic as his pro-style offense while in high-traffic areas. Granted, this is kind of off the top of my head and from an impression of a player that seems like a lifetime ago.
I think Dubois will be a successful forward in the middle 6 of nearly any team and could probably play any role in that 6. Size, ability in traffic, good feet, and a definite competitiveness on display are all part of the overall package... and he produces.