I originally started with LGSM (Linux Game Server Manager). It is a lot simpler than Pterodactyl however it is CLI only and is missing a lot of the features that Pterodactyl has.

Nowadays I use Pterodactyl and I absolutely love it! Once you get past the installation it is fairly simple to use pre-existing servers and you can set up your own server configs if you want.

Can also be used to host non/game server stuff like discord bots, databases, etc which is very nice.