Circulated air incubators are usually better, BUT What incubator you decide is best is very much dependent on your individual needs. Some are more durable, some are easier to clean, some are easier to add water to, some are loads more expensive than others. It is a very frustrating thing to try to decide which to buy. My best suggestion is to start reading as many incubator reviews that you can find, and then decide which incubator will fit your needs best.
I really don't know anything about them. I have actually only used one incubator, and it is a relatively unknown brand. It finally stopped working, and I decided to replace it with a Brinsea. But, I can't incubate anything in the Brinsea for at LEAST three more weeks, the wait is going to kill me. (I don't want to take care of chicks when it is still freezing up here)
Incubators with fans are considered better as they wont have cold spots, at least not as large or as many. People have excellent success with still airs though. The trick with them is to measure temp at top level of eggs and set it to 101-102F. The best bang for the buck in my opinion is Hovabator. Still air or with fan, they have the extremely reliable user friendly wafer thermostat. Love mine. Two used, excellent condition, with fan up for auction now (new these are $80 free shipping): http://www.ebay.com/itm/1602N-HOVA-...157?pt=LH_DefaultDomain_0&hash=item3a8c069e55 http://www.ebay.com/itm/GQF-HOVA-BA...542?pt=LH_DefaultDomain_0&hash=item19e926b186 New still air $50 w/ free shipping: http://www.ebay.com/itm/GQF-HOVA-BA...303?pt=LH_DefaultDomain_0&hash=item1c3d0621af
