I am an Anavar fan, but...
Ox wins when considering everything. No sides or almost none from Ox, while Winny is know for liver stress, acne, high BP, hairloss to name some.
Ox gives faster saturation. Personally i think anything over 100 mgr/day of Ox is overkill, maybe even less.
It is very possible to take more then 100 mgr/Winny a day and still get better result. Some guys take 200 mgr/day of Winny. Ouch that liver.