they both are absolutely similar in performance but slightly difference in features, also you did mention that in my country every part is approximately 30% expensive therefore i suggest you asrock mobo,
extreme4 cost you 184$
asus z68 vpro cost you 189$
both at newegg,
BTW asus then it is way better choice cause of fetures like bluetooth,wifi,LucidLogix Virtu, usb 3.0 boost.
otherwise asrock is also best choose.
only 4 difference in price that doesn't matter too much get either of them.