With all due respect to the Griffons, I'd put them last on that list.
Pivot beats STH, if only because the heel is the best thing available on the market right now, even if it is a gigantic bastard to clip into if there's snow on your boots. The STH toe wins by a small margin, although the Pivot toe is still pretty good.
Axial comes next, same toe as the Pivot, heel is not quite so good but pretty bomber and they're cheap.
Griffon... you can get big brakes for them easily. And if you break them in some backwater resort they'll be able to get parts easily enough. Otherwise, I've broken too many Royal series bindings to spend my money on them any more. Although until I started riding a bit too hard for them (or maybe got too fat?) they served me well.