All given, the fact that Google itself doesn't extensively use GC is kind of a red flag(I know quite a few Googlers from search infrastructure and none of them said their teams used GCE internally).

A solid guarantee with AWS is if AWS goes down, then a multitude of Amazon's services also will go down(ex Amazonian myself), so it gives me a belief that AWS's uptime is more important to Amazon itself that it is for external customers.