One thing that always annoyed me with BOBW was how Picard's borg appearance changed between part 1 and part 2. The eye piece is completely different.
It doesn't just magically change between episodes though. It's changed off screen as The Borg continue to update him, so to speak. (Just as they also do in part 1.)
That said, I also prefer the early version.
Edit: ^ What Mick says.