Look for comparatives in performance between Ryzens 2600 and 2700 and the 8700k. In my country the price difference is just enormous but the performance in games definitely isn't. The 2700 doesn't really take advantage of its extra cores over the 2600 for performance in games so both are slightly under the 8700k in performance, but Ryzens manage better programs in the background like recording or streaming (which I don't know if you use) and sooner or later the extra cores of the 2700 will be used and show an advantage over the 8700k.
As a reference, here a 2700 costs 280€ and the 8700k costs 410€. Additionally, Ryzen processors come packaged with reasonably good coolers (the 8700k doesn't bring one) and in terms of reliability, a CPU is extremely weird to be broken, Intel or AMD, there's not really a difference when it comes to that.