This is just an RMTP server to stream live video through Zap.stream and Amethyst without paying 10 sats per minute haha.
Relay is extremely easy to run from a VPS!
Full node is a bit more difficult, it'll eat a lot of bandwidth and if you wanna use it as a backend for say Mempool you can't prune it either so you'd need at least 1TB storage.
Then you have the security aspects to consider when you run a full node on a VPS. I'm fairly good at locking Linux servers down but I'm not sure I'd trust a full node I set up running off a VPS.
TL;DR: Relays are very easy to setup on $5 VPS's but full nodes are both more resource intensive and more sensitive security wise. I'd wait until you're able to run your node from your own hardware personally.