I have a 240+ core cluster running on GCE now with additional appengine frontend for some api items, and I loathe the environment. I've used Heroku, AWS, Azure, Digital Ocean, and IBM SoftLayer in the past. I worked on service readiness and billing on Azure at Microsoft.

If it works for you thats good, but it wouldn't be my first choice even if I found it to cost less than other alternatives.