A lot may depend on the area of the country you live in and how the fuel has been stored before you buy it. My LHS stores the gallon jugs on an open shelf unit, which is not good. I'm sure they don't stay there for more than a month or so, but when I buy from him, I try to catch him when the new boxes come in and he hasn't had a chance to open them yet. That being said, I have tried Cool power, Wildcat, Omega, and O'donnel all purchased from his store in 10% and 15% nitro.
I like the Omega and the Wildcat the best, I seem to have less midrange tuning problems with these fuels. May be something I'm doing, I don't know, I just know what works. Cool Power is ok, I'll buy it if he doesn't have the other's. O'donnel does not like me or my tuning habits for some reason, I won't buy anymore of it. Just my 2c here in West TN.