If you're hoping for a definitive answer, you're not going to get it here (or anywhere else for that matter). Right now the best choice is whatever you can get the best deal on. Both CPUs are excellent and are great choices. Nobody can guarantee "futureproof" (although AMD has said your AM4 motherboard will be definitely good till at least 2020 unlike Intel) but thats about as close as you will get.
What you are doing is not demanding, either processor family will play it very well and perform similarly.