I ran the Vortex Fury 5000 at the Steel Safari this year. 3 day match, where finding and properly ranging target is probably the most important thing. The Fury did great! The range finder is fast and super accurate. I simply don't think you can beat them for the price. The glass is pretty good, but not like the Euro brands (Leica/Swaro/Zeiss), but those are at least 2x-3x the price.

I spoke with Stevec23 about all of them, he thought that the SIG & Vortex are probably the same. Same glass, same laser, same factory, etc. I believe the Nikon LRF bino are the same too. It sounds like the SIG has a little better technology (bluetooth/BDX/AB) in their bino, Vortex does not. Vortex warranty is the bee's knees though.

I would base it on what is most important to you. Glass quality, ranging capability, technology, warranty and service.
Glass Quality? Go Euro.
Tech features? Go SIG
Warranty and pure ranging? Go Vortex