no worries about teh asus, its solid cooling
just dont be scared because it has passive fans so wont be active until GPU gets 65c, so can be very quiet, sometimes people think it doesnt cool right, it just has higher idle temps, which is fine, when cooling kicks in it will chill down super
Strix is solid
check if the strix you look at is the OC version to 1355mhz or normal strix version, if OC strix version it has factory clocks higher than MSI, so bonus 1 dollar saved