It's not (at least to my mind) like there's one upright canister gas stove that is so overwhelmingly outstanding that it outshines the rest in all aspects. Rather, I think it's a series of trade offs. I think one has to decide what is important to them and then choose accordingly.
-The Snow Peak GigaPower is an excellent stove. It's strengths are compactness, durability, and good pot stability. But it weighs a bit more, especially with the piezo ignition.
If you wanted something from the current crop of stoves, here are some thoughts:
-The Soto MiroRegulator is an excellent stove if you want light while still having a piezo ignition. It's not as good on compactness or pot stability (not bad, but not as good as the GigaPower in my estimation). Don't expect cold weather performance to be any better than on any other stove.
-The Fire Maple Hornet (I've also seen it called the Wasp) is the lightest and is very compact, but I doubt its pot stability is anywhere near that of a Gigapower, and it's loud. There have been some issues reported with the jet getting clogged. I don't know how prevalant those issues are (they may be isolated).
-The MSR MicroRocket is a nice stove, far more compact, far more durable, lighter and with better pot stability than the older PocketRocket. If you like the PocketRocket but want some thing lighter and better, then the MicroRocket is a nice one. You could think of it as an improved, lightweight PocketRocket.
FWIW, I actually like the Kovea Camp 56 (the "Supalite") which is fairly light, is reasonably compact, and has good pot stability.
Adventures In Stoving