I would rather get GSkill because it is a good brand and you can likely simply add some voltage and up the clockspeed to 3600. In the end, while fast memory improves performance, the difference even between 2800 and 3600 is not something which would make an unplayable game playable if you just had better memory...
If you really want good memory, you need to get some Samsung B-die based kit. You can identify them by subtiming, which are like 3200 CL14-14-14-34 or for example 3600 Cl16-16-16-36. These things are pretty much the fastest and if you add voltage, you can often push then way further. For instance if you can't get 3200C14 to run 3600C14 you have bad luck. You'll probably need like 1.375V-1.4V to do it.
"but i also read that sometimes is cause "instability, crash, and sometimes bsod" during game. it is true?"
2000-series Ryzen had trouble reaching or going faster than 3200
3000-series could mostly do 3600 and 3733 was not uncommon, some did 3800
5000-series should have no problems at 3600 and though I never had 5000-series, they will likely do 3800-4000? If I was building one, I'd get 3200C14 B-die and OC it to 3600, but just for fun, not because it would make sense money wise.
If you just want bang for buck. I might consider 4x8 Gb as four sticks are faster than two and you can just throw in some fairly basic kit and just use it.
