Both the Zeiss conquest and the new VXIIIs are excellent scopes. I think that the new VXIIIs may have a bit better light transmission, but you probably won't be able to tell. The conquests are relatively new, but have received positive praise thus far. The Leupolds, of course, have been around for years.
The new VXII is essentially the older Vari-X III.
As far as objectives go, I generally like bigger objectives, like 50mm. But that's just me. I don't like them on rimfires, but I do like them on centerfires.
You can't go wrong with either the Zeiss conquests or the new VXIII.
Zachary