I've not seen Glennie play but Reilly is having an amazing season on a Redhawks team that's had its fair share of struggles. His 19 goals lead the CCHA, which is great as a sophomore. He's tied for third in the league in points. He plays on Miami's first line with 2 seniors who are both Hobey Baker candidates.
I guess the question with college player is always can their bodies handle the 82 game NHL schedule. Reilly needs to work on his size but he's only 19 still. I think he can put on some more bulk. IMO, he has all of the other skills.
As was pointed out in the prospects thread, there's a decent possibility that Reilly turns pro after this year. If so this thread will be much more interesting a year or two from now with these guys having spent time on the same farm team rather than comparing across different levels of competition.