I think I would vote for the Viper XLS if given a choice. If you are going to use it for both gun and bow then I would choose the standard Viper over the Ultra simply because I think the gun rest would get in the way and be a pain to constantly take off and put back on depending on what weapon you were using.

I like the Bullet too though and we sold alot of them down at the local shop. But, as mentioned above, if you are not going to be packing it in for a long hike to your stand then it doesn't serve any major advantage.