Nero. worst case scenario..
bit extreme I guess...
How about this... It is the general consensus that RecordNowMax (and earlier versions like PrimoDVD) are the best tools for the job. However, if you want to use NERO.. and it works reliably for YOU while burning XBOX ISO's, then by all means use it.
When I slithered into the scene... the choice at the time were Prassi PrimoDVD and Nero. On the same media, using the same premastering tools... Primo produced the better burn. On Re-Read tests disks burned with it simply burned more reliably. Also... Nero's update have been mostly to include new Burners... whereas the PXengine updates include fine tuning for actual burning. RecordNowMax simply improved on the original PrimiDVD. (and improved support for the Pioneer burners)
Course, this is ALL with ISO burning. UDF burning I'm not fond of, whether it is for XBOX.. or PC. I try to steer most away from it.
I have no personal Bias against NERO. I still use it for VCD and SVCD burning, and is my preferred tool for such burning at the moment.
I'm developing a TUTORIAL.. hopefully Xantium will post it on X-S. It is a comprehensive guide, to Building ISO, extracting ISO, and Burning (DVD-R, DVD+R, DVD-RW, DVD+RW, CDRW, and yes CDR) with the leading software.