If you know iptables, just stick with that. In my testing, docker containers seem to ignore ufw rules. Supposedly, iptable rules are respected but I haven’t learned iptables yet so I can’t verify.

SerpentOS is it’s own thing. It’s from the same guy who made Solus which was also it’s own thing.

Look up Ikey Doherty if you want to know more.

From my experience with Solus, I don’t have high hopes for SerpentOS but I’d love to be wrong about that