Well I must say that the comparison is very good and the factors that were used in the comparison are imperative and yes if someone wants to compare IaaS providers or you can say Cloud hosting providers then one should consider those factors to evaluate which one is better according to their needs. According to what my understanding is, SLAs, pricing plans, monitoring, and outbound data transfer fee are the much considerable factors.
The research says that AWS, Rackspace are among the paramount names of the industry and very rightly said, because they are the best! I have discovered a resource where I have got a huge number of cloud hosting companies including the big guns. They are being categorized with respect to price, free trial, etc. etc.???
Source:
http://www.cloudreviews.com/blog/best-cloud-hosting-providers 
