The 60fps are a huge difference, that for sure.Download both and see for yourself. Some people can tell the difference, some can't, or barely, or don't care. Personally, I find it very easy to notice, and another thing that's a huge plus for me is that's it's 60fps. Another spec some people don't really care for, but others do
30fps is "cinema-style", while 60fps is like RL (IIRC 60hz is the frequency when your eyes and/or brain realize something as a "liquid movement").
But to 4k i have to say: it's not worth it as long as you don't have very good eyes and an above-the-normal-big-screen.
I have an 60" screen and i have no need for 4k - even if my TV is capable of it.
The difference is minimal and the file-size is mostly absurd.
Maybe it's rewarding for your 5 or 10 most beloved clips/movies, but that's it.