One thing that I liked with GCP is their recommendation for cost saving. I spun up a compute engine for a hobby project and within minutes they gave recommendations to reduce the instance size and how much i can save. I don't think AWS offers something like that. Correct me if I am wrong.
Even better are Google managed services (PubSub / Dataflow / Datastore), which scale up and down based on usage (cloud native products) and thus save money automatically compared to their equivalents in AWS (Kinesis / Kinesis Analytics / DynamoDB) which does not autoscale.
Most of the Trusted Advisor checks are only available if you're on a Business or higher tier support plan. And those are now priced as a percentage of your monthly spend – not cheap.