You talk about SQL and No-SQL as managed services and it shows that your experience is limited to a classical application consisting of virtual machines and some data storage. However these are not the only services offered by both platforms and currently AWS has a richer feature set. For example Lambda and its deep integration with whole AWS platform is the biggest game changer from my point of view. If we are talking about virtual machines and databases, I can accept this comparison. However we are talking about 30+ services, some of them are even not available somewhere else and solving serious business problems in production and at scale. It is very wrong to put everything into basket and compare. Maybe GCP has better pub/sub service and AWS has better object storage. These should be compared seperately. Answering to your question, why do we still stay at AWS, because it is solving our problems in the most cost effective way and with reduced complexity, we are happy with it.
I specifically spent a lot of time on Lambda and found it quite annoying compared to GCP AppEngine. So much bureaucracy. Just this thing that you have to specifically register every single Lambda API call and its parameters using an interface built by non-thinking people.. Sheesh.
For on-demand processing I just want a single HTTP-ish entry point, like AppEngine provides. (That way I can I move my service between different providers, if I wanted to move away from e.g. AWS.)
