I'm impartial to Cherry Bombs because of their old-school pedigree. As I recall, my Dad had them running straight off the headers on his Camaro for some time, but I think he changed them out eventually. However, Cherry Bombs seem to suit the Chevrolet and Mopar crowd a bit better than the Fords, but then again, I can't think of many Fords I've heard with them before.
Flowmaster is going to be the best option. Their 40-series always sounds pretty good, and if you want to be outrageous, they offer the Super-40 option.
Either way, it depends on what you like. If I'm building a loud car, obviously I want Cherry Bombs. But generally speaking, I like mine just having a good rumble and a throaty overture. That means the quieter 20 and 30 series pipes from Flowmaster, or maybe a tuned option from Borla.