REI All Season Bivy vs Outdoor Research Helium Bivy

Hi!

So as a birthday present I was given the option to get either the REI all season Bivy or the Outdoor Research Helium Bivy, I tend to just use tents because usually I'm going with someone else so its just easier to split the weight between me and a friend and just bring the 2 person tent I have... but it is heavy for one person (~8lbs a four season tent) I was talk to a friend about it and he pretty much said, here I have these two bivys pick one.

My Primary use was going to be for high altitude (greater than 10k ft) Summer to Early Fall backpacking. Basically Mid to Late season backpacking in Yosemite and the High Sierras. I want a bivy that can handle the potential kinds of weather I could encounter while im up there.

I asked him and he said that its kind of a toss up. I was wondering if anyone else had experience with these bivys and could tell me how they are in comparison?