I have a few favorites,the Compact +plus is tops,has full size scissors super useful esp. for emergency grooming or trimming broken nail,etc.. and with the plus feature you get a pen(pressureized like space pen),small screwdriver,and safety pin for splinter removal,cleaning out small grooves in gear etc..
The Executive(more robust than the classic size saks) is also very nice,slim fit in watch pocket you will forget you have it, excellent for opening pkgs. ,personal grooming,has a serrated mini blade(orange peeler)have used to cut paracord,you can also use suspenion clip(can use with mostly all SAK's) to hang from your pocket
these are a couple of my favorites, YT has a ton of different uses that each model and tool can be adapted for