I know of iptables. I know of ufw. I've been using ufw in the past just because it's easier to setup and use.
However, which one should I be using? Is iptables more secure? Is ufw more stable?
I have no idea, hence why I'm asking here.
Ufw ( uncomplicated firewall) is an easy to use front end for iptables. Stick with ufw for the configuration as you're already using iptables.