It depends on if you're using them in a closed case, or an open frame. Most people I see use AIB cards with non-blower designs in an open frame. Usually the AIB cards offer a better cooling solution for lower temperatures. But with the OC'd models, you'll usually end up limiting power to keep your power consumption lower for a better profit margin.
Serious miners take the fans and shrouds off the cards entirely and use moving air supplied by stuff like a furnace blower in a tunnel that pulls air in from outside and vents outside. I did this too. Even on a day when it's 90 degrees outside, a furnace blower can cool a couple hundred cards if your rack is well built and thought out. I just used 2"x2" racking with cardboard sides.