We have had very good luck with the sullivan turbos. They may be a little more expensive but you get what you pay for with them, very high quality fans.
I have some fan that is an off brand, not sure as to what it is i think Dayton?! but i got them on sale because cages were bent a little ( no diff then any other cages usually are bent a little) everyone compliments how quiet they are...
The schaefer fans I have dealt with are more of a barn fan, quiter, wider path of air, along with a bigger cage. Like both but my choice is a schaefer, then a jobes, then a sullivans.