Spending on GCP is more predictable than on AWS. Also the general behavior is more predictable. For instance all pre-emptible instances are terminated in 24 hours. On AWS based on when they need the resources.

I believe that whatever GCP does, does better. Faster network, faster spinning and turning off servers, simpler quotas, etc. GCP doesn't offer that many services as AWS and most of those are not very compatible with Apache tools (although they're doing their best, e.g. BigTable looks like Hbase from outside).

In our case, we're running ~28,000 servers on GCE and utilizing many services, especially PubSub, BigQuery, etc. The price we're paying for our setup is roughly 1/4 of a similar setup on AWS.