I'd ask first what CPU you're actually using on that board ??
& also what model PSU??
At the most I'd assume a 6300 at stock speed in which case that will be the limitation.
In that scenario you won't really see any performance difference between the two cards at all , the CPU will be the limiting.
You want to base the decision on
1. Price
2. PSU model , the 480 will require a substantially better quality & stronger PSU than the 1060.
The 480 can pull in excess of 210w,the 1060 sits at around 140w.