garry's mod hosting?

I'd say get a dedicated server.. People say GMC is good but they are just crusty xeons that are reused and just suck. Most hosts are like that unless you get a dedicated in my eyes.. I have a server on GMC right now and it gets random lag spikes out of nowhere and I know for a fact it's not addons causing it. Look up psychz they may cost a bit but they are much better because you can do whatever you want with them like a server and web host.
Gmod servers don't use much ram it's like 2 GBs and most and a web host is much less. All you gotta worry about is CPU.