I prefer the Manix2. It's just a tank of a knife and feels like a solid robust tool. I've owned a few full sized Grips, but just can't get over the cheap feeling handle. Almost feels like a toy. The mini Grip on the other hand, I love. Manix2 wins this debate for me hands down.
I agree with all of this. I would like for my Manix2 to have a little bit weaker spring, otherwise I like everything about it more than the grip.
For some reason right now the Manix2, G10 scales and all, seems to be cheaper than the Grip with its cheaper scales. I have not seen a FRN knife that is nearly as smooth as the Manix2, that is one of the reasons that I like it better.