I got enough budget for 3600x and 3600xt aswell.I was hoping you could inform me about the fps difference between the 3 at stock speeds.(I dont like overclocking).And also is the stock cooler good enough for stock speeds on all 3?
https://cpu.userbenchmark.com/Compare/Intel-Core-i5-9600K-vs-AMD-Ryzen-5-3600X/4031vs4041
Just get an i5 its cheaper and better than all of them for gaming, plus good multithreaded core performance and easier to overclock.
As for your question on the 3600 vs 3600x and xt, my understanding of adding an x on the end is that you can just overclock the CPU higher (and I think it will be factory overclocked as well), and so if you aren't going to overclock it in the first place, its not worth buying. Also I would assume the stock fan is fine on AMD products, however just get a hyper 212 for it, as it is really cheap and has thousands of reviews