I run Arch on the HP Envy x360 with a ryzen 4500u and it's a very smooth experience, I've had no issues. I did have Ubuntu on it at first and it may have been a bad install, but it was terrible. Half the time I'd turn on the laptop and something different would be broken.

I have a 4700u, some device issues at first (touchpad, namely) that work now (as is the case with all brand new laptop models) - AMD cpus are beasts though - can't wait until they start putting them in higher build quality laptops.

Check phoronix.com, there should be several articles about it.