As I have today both Mac and Win Versions, I can render my real Tracks in WMA or AIFF.
As I use Digital Performer, I can choose the working audio format also in WMA or AIFF avoiding the conversion step.

So what is the best strategy ? Which BIAB version brings the best audio results ? If my arrangements are not
exactly at the same recording speed, is one version better when I need some time stretching (20%) for instance ?