ok it appears, that one has a stepped 1,2,3-10 speed for blending. While the other one is infinitely variable (read: no notches). so you can do 1.1111 or 3.2385. If that makes any sense.
I think i'm going to pick this up, for the $37 difference for what i can pick it up here and what i can get it at costco the variable steps don't matter that much to me.
here's the link to the info that i found.