AC-3 (Dolby digital plus) at 640 kb/s or AAC LC at 335 kb/s which is better

[Christopher2222]

I have heard that AAC is favored for it's higher sound quality at lower bit rates however AC-3 excels at delivering immersive sound experiences.

So just by the rates I've given in their formats, is it safe to say they are almost equal? Or could someone easily say hands down the higher bit rate AC-3 would/ should be the better audio?

Is there a clear winner here?

[pandy]

AAC is capable to deliver same or better quality at the same or lower bitrate but... AC-3 has probably highest market penetration from all multichannel capable codecs - so AAC is more modern and versatile but AC-3 is for sure most popular audio codec.