I spent a lot of time tied in between those two products, they were both much lighter than the competitors. My conclusion was that Zpacks is slightly higher quality, but EE has REALLY good value. I think I recall that EE was slightly narrower too, since you don't need as much for a hammock. Also, the pricing is weird - if you look at surface area of quilts for a given temperature rating, some of the EEs are actually costlier.
In the end, I would say just choose what size you want and go for the cheaper one. Sleeping bag weights are limited by down quality, fabric, and dimensions. Both companies have high quality down and fabric, so it comes down to the dimensions.
Zpacks does come with cuben fiber stuff sacks though
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