We moved from Azure to Gcloud. We are currently using Gcloud's compute engine as we didn't want to get too dependent on the App engine. In comparison to Azure, gcloud VMs are much faster in terms of performance. Managing google VMs are much more easier. For example, migrating a gcloud VM would take only a few seconds even across data centers. Google's support team in India didn't really help, so we designed our own architecture. While google has many interesting features like autoscaling API, global load balancer, cloud storage etc, of which most of the services are in beta stage. We use it anyway, and haven't faced too many issues.

The only place where we had to look for an alternative cloud service was when we attempted to set up our own CDN on https. Google currently supports it's global load balancer only for port 80 and 8080 and they suggested we use DNS load balancer which we didn't like the idea of. P.s. we have not worked a lot with AWS. So I do not know much about AWS. From what I hear, AWS is currently much better and gcloud is good upcoming competitor. Overall, we serve 20 million API requests per day on google cloud without any infrstructure issues so far.