Suh. If you get to pick where your best player is, you put him at DE or DT. They can disrupt an offense more than anyone on the defense or they can take a lot of the offenses effort and focus to stop, which opens up opportunites for others.
Taylor was a do-it-all guy. He could have slid down to OLB if needed. I think I would have to go with Taylor just for the fact he could play multiple spots and still be your best athlete at each position.
Suh was just so much stronger then anyone he faced.
Sean Taylor was great. But I'm pretty sure most people here will choose Suh. And rightly so. Suh single-handedly dominated games to the point where he would nearly always draw double teams. Sometimes triple teams. This is what happened when one guy was left to block Suh:
btw, That was an Oklahoma lineman Suh tossed back into the QB.