Garry's Mod Best server host?

There is no better dedicated server because the more the host the more ping you will have. (my opinion)

OVH by far. Depends if you're from NA or EU though.

I personally use Nitrous at the moment, its 4 for 10 slots

For me ; a vps ( virtual private server) is the best... with some tutorial you can learn bash and make all you want ...and you can find at 5$ but not verry good machine ...

//edit : Use a ovh reseller.

Serenity servers are pretty good im using them currently, or you could use shock hosting or OVH and buy a vps and host the server on there.