I carried a mini-grip for several years exclusively and I like it, but I finally decided that it was a bit small for me and now everything I carry is around the 3.5" mark. My PM2 is about the smallest knife that I carry, and today I'm carrying a new Military.
The reason I like a bigger knife has to do more with the handle than with the blade. I like a big enough handle that I can hold onto it, the minigrip is a bit small for me to reliably hold onto it. My current minimum would be just over 3.25" blade.