My personal opinion....of the two selected, I like the sound of the original 40-series mufflers better. They've got more of a throaty tone to them.
Both systems are going to be louder than stock. Much louder if you add an off road H/X-pipe to the mix.
There's a trade off to that additional flow and muscle car sound and it's interior resonance. Both systems are going to drone on like crazy at highway speeds. Some people can handle it, some people like myself can't.
Flowmaster, Mac, Magnaflow, Spintech, Dynomax, Corsa, etc all make nice systems, of varying quality and price points. My suggestion to you is to check out youtube for some comparable systems, talk to owners and decide for yourself which one you like the best.
Long tubes will yield the best power results, short tubes will be the easiest to instal. X and H-pipe is strictly sound prefference.