I have the Sidewinder SV. Fantastic jacket; great for travelling since it weighs next to nothing.. I think there's three main decision points; are you ok with the side zip, are you ok with a fixed hood (the hood doesn't stow away on the SV, although it does on the Sidewinder AR), and how many pockets do you need in the jacket.
I have no issue with the side zip, although there's a flap behind the zip that sometimes annoys me when the thing is fully zipped up. This is the first jacket I've used with a fixed hood - no problem. I ski with a backpack, and therefore have no real need to stash stuff in the jacket, which is a good thing since the jacket has very few pockets.
Other options would be the Sidewinder AR (stow away hood), and the Arcteryx Stinger (stow away hood, straight zip, higher collar). I bought a Stinger as well (I like tucking my face down behind a collar on storm days) although I've not yet used it.
Note that Arcteryx stuff tends to run a little large, so if you're between sizes the smaller of the two might be the way to go.