From what I have gathered the Burris and the Vortex Venom are very similar. Both have outstanding customer service and are comparably priced. The only real difference is the multiple light settings on the venom and the addition of a rain guard on the Burris. I ended up going with the Burris since during the turkey season here it can be rainy and such during our spring season. Matter a fact I am in the process of building another dedicated turkey gun for the wife right now and bought another Burris for it, Unfortunately someone thought they needed it more than she did and stole it so I am saving up for another.
The one I have mounted at the moment is on a Mossberg 835 and has held up to the recoil very well. Her gun will be a Stoeger M2000 with a pistol grip.