what is the best mode for writing Audio CD ??

mmm.. i think track-at-once.. but the final result is done by cd-burner!! i've a plextor 24x and yamaha t@2 wich include The AudioMasterQuality option to avoid the writing error the most possible ( it clear wave pattern to have higher soun quality and lack of background jitter).
In alternative i suggest to use Feurio for Audio burner...
 
It can also depend on what you're doing - i.e. you're not going to write a continous flow of music which is split up into tracks in track-at-once mode because you'll get tiny glitches in the transitions between tracks.
 
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