Both are good scopes but I see them as being for quite different purposes. The Swaro is an excellent hunting scope, it's lighter than some 3-10x40 scopes and not having the adjustable objective is an advantage in some hunting situations.
The Zeiss is pretty heavy at over 20oz but has target knobs and side focus which are advantages on a tactical style rifle where the extra weight isn't as big an issue.

I'd choose the scope depending on whether the rifle is a hunting or a tactical style rifle. I don't think the optical differences are nearly as great as the features differences...............DJ


Remember this is all supposed to be for fun.......................