From IaaS/PaaS perspective, you should look at the 1) Range of available Options : Is the infrastructure providing faster computing resources OR storage OR database services OR a combination of many. 2) Pricing : Fixed Pricing or Pay as you Go. Later being the best. 3) The current trend of incoming and outgoing traffic of the provider: Most chosen by customers or not. 4) SLA : On the situation of an outage, what is their policy? Refund ? History of outages ? 5) Scaling systems in place : Are load balancers installed by the providers which keep the service instances always up.
Abhishek Sivasubramanian Senior Software Developer Suyati Technologies, India