I recommend you chat with some of the expert witnesses in the chat that have more experience running on such services. I'm using my own server, so my experience is a little different. The feeling I get is that if the CPU/RAM match, the bandwidth is really important - if throughput is inconsistent, you might miss blocks because you're too slow to respond. I'm sorry I can't help you more but I've only been running my node for 4 days and this article is the information I collected while doing it.