As a rule, dual fan setups are more effective/quiet, so the ASUS is better in that regard. It also is a tiny bit faster than the EVGA. What I don't like about the ASUS is that it's too close to the price of the GTX 660 for it to be a good value GTX 750 Ti, and the GTX 660 destroys the 750 Ti.
I wouldn't recommend either, personally. I would probably go with the PNY: http://www.ncixus.com/products/?usaffiliateid=1000031504&sku=94972&vpn=VCGGTX750T2XPB%2DOC&manufacture=PNY%20Technologies%20Inc&promoid=1230. (It's clocked higher and would be faster than the ASUS, plus it's the price of the EVGA card.) or I would spend a tiny bit more and get the GTX 660. Though if you have a weak power supply, the GTX 660 might be too much for it, so the...