I don't have any experience with the Skookum, but the other two are quality quivers. The EFA is much lighter, even the jumbo size. The Selway will hold more arrows and longer broadheads. EFA does make one with a larger hood for longer broadheads like the El Grande Grizzlies.
I don't think you would be disappointed with either one. If you like the Selway style, but want leather rather than rawhide, Thunderhorn makes some good ones. I have a Linx, which I like because of the bar between the hood and arrow grabber, which keeps them from sliding on the limbs and allows me to slip the whole quiver full of arrows off and on the bow without razor sharp broadheads trying to escape. EFA now makes one with what they call a totem, which does the same thing. I made my own and modified my EFA Cherokee to the totem style. I used a carbon shaft that had had an accident (
) as my totem.