I looked up the minimum and recommended specs for PUBG
http://www.pcgamer.com/pubg-system-requirements/
It would appear that the game does not use many threads, 4 being perfectly acceptable.
I7 in the past had 8 threads, and r5-1600 has 12 threads.
The extra threads seem to not be that useful and worth paying more for.
They say..
As we wrote in our performance analysis: "It's pretty clear that the most important thing with your CPU will be raw clockspeed, provided that you have at least four physical CPU cores…
for that, ryzen of any stripe tops out at around 4.0 for the 1800x.
Lesser chips like the 1600 will be less, and that is with an overclock.
Then, also, the performance per clock is a bit better with intel processors.
In the us, r5-1600 is priced at $215.
My suggestion, for the longer term is to look for a I3-8350K.
The meaning of I3 has changed. What you get with a I3-8350K is a full 4 cores with overclocking. for $190. Effectively, the more modern version of the i5-7600K.
You need not overclock initially, but all of the current motherboards are Z370 based and will permit overclocking.
I see the current crop of motherboards as being reasonably priced.
A number are in the $130 price bracket.
Here is one:
https://www.newegg.com/Product/Product.aspx?Item=N82E16813157793