I was doing some testing of Serververless (the framework) for a personal project. I wanted to do it in Google functions + Database, but even for the basic out of the examples GCS wouldnt work; I spent 3 hours fiddling around. I moved on to AWS lambda + Dynamo and was done in 1 hour.
Also AWS support is simply amazing. Considering Google history of bad support, I wouldnt consider it for anything serious.