To be completely honest, either of those mufflers are going to make it sound like a riced out import above 3k rpms. The only thing I really think would sound decent would be something like a Dynomax with it's packed core, or a Magnaflow since they're similar to the Dynomax.
If your still set on a Flowmaster or Cherry Bomb then flip a coin. They're almost the exact same thing.
1996 XJ Sport, 4.0L HO I6, AX15 5 Speed, NP231, Dana 30/35, Flareless
The Daily Driver
2004 Ram 1500, 5.7L Hemi V8, 545RFE 5 Speed Auto, NP241, Chrysler 8.0/Chrysler 9.25, 10mpg