It's still unclear to me if the stereo versions were remixed or only remastered. If they're just remastered, I recall the early albums having a really lousy stereo mix. Unless you really want to fade between John's guitar on the right and George's guitar on the left, I'd get the mono recordings.
The BBC Radio 2 documentary about the remastering made it sound like there was an awful lot more work than just cleaning the masters up. They were talking about and demonstrating how they had managed to separate guitars from drums and the like digitally.
From the documentary I understood that they were using those techniques to move stuff around in the stereo mix, to get away from the not-really-stereo original mix. Maybe I misunderstood or read too much into what they were saying ?