I own these and I'll give you my impression of the pluses and minuses of each:
SOG Powerlock - heavy duty pliers, little weak on the knife, accessing the knife is a cumbersome endeavour. Overall very sturdy but tools other than the pliers are a bit lacking in strength/quality
Leatherman (Wave & Charge) - great ergonomics for me. Easily accessible knife, saw, file, serrated knife from the outside. excellent pliers. a little smaller than the powerlock and thus it feels a little less powerful, but I think that's just due to the size.
Victorinox Spirit - probably my favourite, but big and heavy on the belt, moreso than the other two above. Great tools, pliers, knife. only drawback is size on the belt, but otherwise a really nice multitool.
If the knife is the primary tool you're looking for, I'd suggest the Leatherman, if the pliers are the primary tool you're looking for, I'd suggest the SOG, if you'd like a good balance of both (but not as good on each single tool) then the Vic.
Hope that helps, and remember the advice is worth what you paid for it.
