Fair enough, I was always on Intel too. As for the performance reviews, as far as I know AMD did some optimizing since release but idk how much that changed game performance.
On the point of your original question if cash is not a hard issue, go for the i9-7820X that should future proof you plenty. If you are looking to get a budget build grab the 7700 non K variant which is 50 bucks cheaper then the K version and you don't need to spend much on the MB since you are not going to overclock.