I can't help but come with away with liking Spikes more after watching all that film. It seemed like McClain would never get off the blocks, but he seemed like that linebacker that will always do what he has to do, but maybe not do more than that (turnovers, basically)
Spikes, however, showed more of a tenacious, hard-nosed attitude to me. He hits very hard, and takes on blocks with an attitude. When he wouldn't get to the ball carrier, he showed he could fight off the block and keep himself in the play, and possibly tackle the ballcarrier still. It seemed like in these situations McClain would be out of the play, and stay out of it.
I'm fine with either one of them though. And while I like Spikes more, I think McClain is more the kind of linebacker we need. One that actually does what he's supposed to do. I think Spikes is someone we'd take if we already had a linebacker that does the things McClain does.