The Leek and the Mini Grip have this attribute in common: when you see one for the first time, you say "I've gotta have one of those". Not "I'd like to try one sometime", but "Gotta have one." I ran right out and ordered up a Leek. I still don't have the more-expensive Mini, but I do have the full-size Griptilian. I bought the Mini for my son, and have envied him ever since.
Of the two, for your purposes, I would recommend the Grip. The Leek is a very slim, elegant knife. I think of it as a knife to carry when I am wearing a suit, though of course I carry it at other times since I rarely have to put on a suit any more.
The Benchmade will take more abuse, I think; prying, battening, using as a screwdriver, etc. My son-in-law has done all of that to his, and more; it still looks like a new knife. The textured scales will be less likely to slip in the field. The Mini is a little better suited to EDC, but you might find the full size Grip works better in camp. Either way, if you can only have one knife, the Benchmade is the one to have.