Similar to my experience with the two. We didn't have regular meetings with our GCP account manager, but they did help us and we had a technical support rep there we were in contact with sometimes. We rarely heard from anyone at AWS, and a friend had some horror stories of reporting security issues to AWS.

Architecturally I'd go with GCP in a heartbeat. Bigquery was also one of the biggest wins in my previous role. Completely changed out business for almost everyone, vs Redshift which cost us a lot of money to learn that it sucked.

You could say I'm biased as I work at Google (but not on any of this), but for me it was definitely the other way around, I joined Google in part because of the experience of using GCP and migrating AWS workloads to in.