There are quite a few games where different versions of a game are more advantageous, Generations console has glitches that can't be done on PC, and pretty sure Sonic Adventure has dreamcast only glitches. So if it's better for you to post iOS stats then go ahead, as it's the same policy for every game. Only time games get separate charts is when it's a completely different game that plays significantly different, not with ports (e.g Sonic 1 2013 and Sonic 1 GBA have their own charts).
Hope that clears up your question. I think if games started getting version specific charts then things would start to get a bit messy, and each chart would have less stars due to it being over more versions.