I've used discwelder bronze for a while now, and I think it's great. I can't provide a direct comparison with audio-dvd-creator, because I've never used it.
a big plus for discwelder (and true DVD-Audio discs), is the support for many sampling rates. DVD-Video discs are limited to 48 and 96kHz.
with discwelder bronze, I can burn 16/44.1 DVD-Audio discs. While the main purpose is to be able to burn 24 bit audio, it's nice to get a whole show on a single disc. (a show from years ago that was taped at 16 bit). just something else to consider.