we have camped at both of them.
rex hale is more open, with less shrubbery etc to block views of the canyons walls, etc.
having elec is nice, with 50amp power.
wapiti is closed in with thick shrubbery and trees, so each campsite is more private. and it is closer to Cody, for coming and going, etc. 30amp power.
DH says the spots are smaller than rex hale, but doable.
we also stay down at Buffalo Bill State Park which is very nice, with or without elec. and after the the middle of Sept, they don't bother with reservations which are only important if you're going to be there in hot weather and need a/c.
