I use Studio One 3 for album assembly, it's great for that...better than CD Architect IMHO. That said, I still have to do certain mastering operations in SONAR and shuttle files back and forth between the two programs, or use the Montage feature in Wavelab (which has its own issues).
SOP having DDP export is wonderful, especially since the latest maintenance release fixed the fatal DDP export error (hopefully it also fixes the CD writing problems that required me to switch projects over to Studio One 2 if I wanted to make test CDs for clients).
However, the reason I don't use SOP for multitrack projects is because SONAR has features that are essential for what I do, and Studio One doesn't have equivalent features. That doesn't make Studio One inferior. It makes SONAR a better match for the kind of work I need to do. I recognize that no program will ever do everything I want, so I use SONAR because it comes the closest by far.
On a different topic, this should have been posted in the Software forum because the thread has nothing to do with helping SONAR users make better music with the program. I don't think the intention of the OP was to be rude to his hosts, but this kind of thread can end up being a magnet for those who are, or who lack common courtesy.
(SONAR tip: If you don't select anything and Export with the default settings, everything will be exported without the need to Select All.)