They're both focusing on a container-native, Kubernetes oriented and opinionated cloud. They're both heavily investing in Kubernetes development, AI integrated technologies and the results are visible in the quality of their container offering. Despite their reputation for obtuseness and lack of support, as an enterprise customer, we've had fantastic support, quick turnaround on issues and the actions taken on many of our feature requests.
As a developer, I've found GCP to be somewhat behind in features BUT man their documentation is good, and easy to use. Despite this article, I would bet big on Google Cloud. They may be late to the cloud, but they have some of the best people. Maybe its due to Google Research? But I don't see them going anywhere soon and in fact, I do see them as the next iteration of AI-heavy, big data optimized and container native cloud (sorry, couldn't resist using all of the buzzwords).