Completely modified Bitstream and Bidat are very close, and in my opinion it takes a VERY high-resolution system to fully enjoy the difference. For most (again, in my opinion) the decision comes to need for balanced connectors and volume control.
Museatex Bitstream vs Bidat
I've emailed John Wright asking exactly how big a jump in performance there was between the Bitstream and Bidat. He mentioned that when both fully modded they sound different from each other and neither was better then the other. The bitstream being more musical overall, while the Bidat picked up more inner detail. Anybody compared for themselves?