They both play very similar. I think Sherman makes more plays but that could just be how I have them placed in the depth chart
I think Sherman is better...but...if this a short(ish) term deal than Humphrey is a good option. Card is cheap and has a guarantee return of 250K...so a fairly cheap rental and the card play very well (but...Sherman card does play better).
I have both. Really hard to tell right now because of the strat bonus. Sherman gets crazy leap animations on next gen. I would love to comment about run defense but I never play anyone that runs, other than Henry to the sideline.
^