For the money I'd go for the GB2. The M4 steel in the Gb1 has held up well for me, the Grip still has plastic grips that feel a little cheap to me.
A month ago, I would have hands down said the Griptilian for its lock strength and unparalleled ergonomics.
Now, though, I'm a total Spyderco nut, and I'd be very surprised if the fit and finish on the Griptilian were comparable to that on the GB2. While Spyderco's fit and finish is not perfect (for the most part, in my experience), it's better than Benchmade's, and Taichung Spydercos tend to have some of the best F&F to be seen on production knives. I don't know if that's always the case, but I do know that my only Taichung Spydie (Sage 1) is absolutely perfect.
Saw both.
Can only afford 1.
Love the M4 from Spyderco.
Love the Axis lock since I'm a lefty.
Not familiar with 20cv steel.
What would you get and why?
Why is there always an "intended use" post?!?!
Anyways..
I'd go with the grip, hands down, I just got the mini grip in 20cv and the new feel is amazing.. I have many mini grips with differing scales and this set is one of the best in hand.. plus 20cv to boot!!
Let us know what ya get and how you like it.. good luck