well if you follow this chart then the 970 is 3 tiers higher than the 760 so should be a good upgrade. :- http://www.tomshardw...view-33383.html
personally though i'd still advise waiting until the 1070 comes out and you can get your hands one.
out of those 2 boards i'd probably get the asus, personally though i like gigabyte boards myself and what i use in my builds, i also like asrock boards. to be honest though i don't really think the make of motherboard makes that much difference just as long as it has all the features your looking for, at a price your willing to pay.
Edited by terry1966, 07 June 2016 - 06:20 AM.