I found someone doing a PS3 playthrough, looked stable performance wise.
Digital Foundry has an article about the last gen versions, but its trash. Long winded as fuck with not that much tangible info, the framerate will randomly dip in the open world, doesn't dip below 20 fps though. 360 version is better during cutscenes when it comes to performance, gameplay wise they're very similar.
Comparatively, Phantom Pain on last gen runs better than most Rockstar open world games. I loved Rockstar's output last gen, but performance for all their games were sorta fucked.