A couple of months ago, I went w/ a 2700X. I put the money I proactively saved vs Intel into my extravagant GPU purchase.
If you’re buying a PC for gaming, and intend to play at 1440p or 4K the Intel gains diminish quite a bit. With any one of these processors, at higher than 1080p resolutions, the games are GPU constrained, not CPU constrained. You can see specifics on these charts: https://www.techspot.com/review/1730-intel-core-i9-9900k-core-i7-9700k/page4.html
I’d also guess AMD lowers prices even more, or offers deals, over the holiday shopping season to make it more worthwhile. I also expect AMD to come out of the gate in early 2019 w/ a smoking 7nm CPU that dominates the year, while Intel struggles to achieve 10nm.