In a recent submission, it was suggested that if a game is ported to multiple systems, only one version of that game should be valid for The Vault. Any runs for other ports (unless they qualify for Moon) should either obsolete that run or be rejected. Accordingly, this submission was rejected.
I was not aware that the site had such a rule, and speaking purely for myself I enjoy watching runs of the same game on different systems, such as
Prince of Persia (which currently has vault runs for NES, SNES, and Genesis) or
Bubble Bobble (which currently only has a NES run, but could potentially have an Arcade or a PC run as well). Often, ports will have different graphics, sounds, and glitches.
Also, if only one port is to be allowed, which should it be? The original one? The one that is fastest to run? The one that looks prettiest? The one on the most popular platform?
Perhaps we should have some group discussion about this topic...