Speaking as a Hawkeye fan, Iowa played against both players. Michigan's defense was horrible, but we could not stop Graham. He had an absolutely monster game. Derrick Morgan did absolutely nothing against Iowa in the Orange Bowl. PLEASE do NOT pick Morgan. Graham is definitely the man. Not even close. Both of our OT's Bulaga and Calloway will be drafted this year. Neither of them could stop Graham and Both of them handled Morgan without the need for double-teams.
Also, I'd put O'Brien Schofield of Wisconsin in the same catagory as Graham. More of a 3-4 OLB, maybe, but Iowa had just as much difficulty with his speed off of the edge as we did Graham. He was having a great off-season, too, until the ACL. What a shame... he could really be worth a 7th round gamble.
Having said all of that, I would trade BOTH Graham and Schofield for Jared Odrick of Penn State. What a monster! IMO he was the best player at any position in the BigTen last year. He's a man among boys. I think he could play all 3 down lineman positions.
Just my 2 cents