MP3 vs AC3

[thezanny]

Guys, for a DVD Rip in 700MB, what audio suits better?
anyway, I select the Bitrate as 128 Kbps too.

I heard that AAC gives super quality but it's not compatible with alot of DVD players ( standalone )
So, in this case it leaves me with Mp3 or AC3..
I've seen AC3 and Mp3 but I can't get a quality difference,

I believe that I can get a pro answer

[guns1inger]

At such low bitrates it probably doesn't matter. AC3 will do less butchering to the stereo field, but if you can hear the difference, does it matter ? Do you have audiophile quality amplifiers (valves and at least a 5 figure price) ? Then again, if you are happy to crush a DVD movie down to 700 MB, quality is the least of your concerns.