I guess, it's much of a muchness between 50 and 60fps (in terms of what the human eye can see).
I trust what Kodi tells me, all the normal content (1014 / previous RWC games that are currently on SS come up as 29.970). The only high fps video I have access to is the SA v JPN game, which registers as 50fps.
I'm also assuming (based on my experience) most modern hardware auto frame switch (between 24, 30, 50 and 60hz) so you wouldn't really notice the difference. If you get stuck with your display on 60hz and play 50fps, you notice stutters.

