I imagine Harmy's logic about the Blu-ray release is that it's far easier to take a BR image and convert it into MKV/AVCHD/etc. than it is to go the other direction. In this sense, it's the "better" format, as it's the most complete/final, and everything else simply involves some reduction of that release.

I'm fine with any release, but I'd prefer Blu-ray because I'd like to see what Harmy does in terms of setting up a menu and/or chapters (assuming he does either, which he may not).

Also, please note that VLC and other players should play a BR image without modification. i.e. No burning required.