Depends, I'd have to say for me it's a tossup between the Victorinox Swisstool and the Sog Powerlock.... depends on what i'm looking for. They're both about equal as far as pliers go, maybe favoring the SOG a bit more, simply due to the design... I like the fact that with the Swisstool, if you need the pliers you open them, anything else is all already accessible & also locking, without having to open the unit, take out the tool, lock it, close it, use it, etc.
The Leatherman's never really appealed to me all that much I find that the action on pretty well all of them tends to be "rough" compared to either the Swisstool or the SOG or even the Gerbers for that matter.... The easy access blades I don't find excites me all that much because for me, if I'm going to need a knife, i'm going to grab my knife, not my multi-tool.
That being said, if I wanted screwdriver bits en masse, Leatherman is the way to go.
Although the Swisstool Plus kits come with bits that fit your average drill.... so you could interchange...
Overall if I was going to buy one, (and I probably will someday) I'd probably end up with the Swisstool.
The Leatherman's never really appealed to me all that much I find that the action on pretty well all of them tends to be "rough" compared to either the Swisstool or the SOG or even the Gerbers for that matter.... The easy access blades I don't find excites me all that much because for me, if I'm going to need a knife, i'm going to grab my knife, not my multi-tool.
That being said, if I wanted screwdriver bits en masse, Leatherman is the way to go.

Overall if I was going to buy one, (and I probably will someday) I'd probably end up with the Swisstool.