You can go with either kit. Which board are you looking to purchase?
I just plugged in 4 x 8GB Flare X 3200 CL14 into my gigabyte X570 pro wifi and it is completely stable with standard XMP settings on a Ryzen 3800X.
With the Ryzen 2700X and X470 ultra gaming, it would not boot at all with those same 4 sticks and XMP enabled, BIOS would restart 3 times and reset to default. It would run on its default JEDEC 1866 MHz CL13 settings though, and im sure playing around could have got a frequency somewhere in between, like 2666 MHz CL14 maybe.