I don't know, I'm currently using Linode and am trying to keep my stuff as platform-agnostic as possible (just give me dumb Linux boxen).

Most of the great new features proliferating on other providers seemed designed to encourage vendor lock-in. On my current project, I made one concession to my usual aversion to proprietary lock-in and went with AWS S3 for storage of user uploads (also looked at Azure's offering but my BizSpark application was denied, so meh), since there really is no equivalent. I'd thought about using Linode's beta block-storage (which would have probably been more performant), but I was afraid I would be forever fighting with managing volumes and nfs mounts (or massively overbuying capacity).