I prefer the big shot. Shooting here in the south, I'm more frequently sweaty than not. The fullshot soaks up a lot more sweat than the big shot and I just use a glove with the fingers cut out of it in the winter to keep my glove hand warm. While I have not worn out the stalls on any, I have destroyed the straps on two as they deteriorated from the salt from sweat. Mostly from 3D shoots and stumpin in the summertime. That may not be a problem for any guys up North, but might be something to consider in TX. Those two now have a nylon/velcro band that I've sewn in place of the leathers strap and still going strong. Still the best glove on the market, imho, just wish they built the strap out of something synthetic.
I would also recommend either buying at a place you can try the glove on, or fax them a tracing of your hand. I have found the sizes of the gloves to vary quite a bit. They tend to run on the small side too.
I've got 2 elks and a buff; I think the buffalo is worth the extra money. That leather is still pliable but feels much tougher/thicker than the elk.