How do the VM sizes in Windows Azure compare to those in Amazon Web Services and Google App Engine?
Windows Azure offers four unique instance sizes: small, medium, large, and extra-large. The smallest instance in the AWS offering is 32-bit, whereas all instances in Windows Azure are 64-bit. Further, the smallest instance of Windows Azure has more processing capability (1.4-1.6Ghz) relative to AWS’s smallest instance (1.1-1.2 Ghz). Google App Engine does not offer any flexibility in instance sizes.