We're talking favourite films here. This film is what started off the whole home video collector thing for me - the original Norwegian release of Robocop was shorn of a whopping six minutes by the censors at the time. The incentive to purchase yet again would be for the new supplements. The MGM blu ray from 2014 has excellent picture and sound quality. For someone like me, that might be worth it, although Arrow is also releasing Oldboy, American Werewolf in London and The Far Country this autumn, and these have new transfers - which I'd give priority to purchasing.
Like others I want to read the reviews first, though I am sure this release should be "definitive." It is too bad this wasn't offered prior to the MGM remastered release since so many don't wish to double dip on the same movie. Add to that the extra cost for this one. I hate to play the "if only" game but had this gotten a 4k UHD release it would already be in my cart but given the nature of the way this was filmed I'm not sure if UHD with HDR release would benefit this picture.