Firstly, if you can access your root domain, but not the subdomains, you have configured something wrong (unless you are using multiple IP's). That's YOUR fault

Firstly, if you can access your root domain, but not the subdomains, you have configured something wrong (unless you are using multiple IP's). That's YOUR fault, and neither Prgmr or Linode is likely to help much there (although in both cases, people in the channels are more than happy to provide some suggestions). Now, in regards to stability, I find both to be equal. The difference is, that for the cost of 1x Linode, you could buy 2x Prgmr nodes in different location and run them simultaneously to provide much better stability. Maybe you should jump onto IRC, but from the sounds of things, you may not have the experience to administer a Prgmr Node. Linode is easier to learn with, but is much more expensive Just onto Freenode IRC / #prgmr, and people will help. But honestly, there was a short server outage a month ago, but your current server issues are likely configuration faults on your side.