I say that if you sleep cold, like myself, a wider UQ will serve you best. I keep saying this, but my 3S Hammockgear comes up the sides a bit, which makes it so hat I don't need much on top. I am small, so I cant picture a big guy getting enough coverage with a 40". But others seem to do fine, so..
Mountaingoat Hats & Goods
|40", opinion, width|