I have spent a significant amount of time on each and would suggest it's the only actual cloud. The others are data centers masquerading as a cloud, notice when us-east has issues for AWS, Azure had a spof dependency on a datacenter that didn't even have AZs... GCP is architecturally on another level. The others seem to be unaware of what 'cloud native' means, so if you are attempting cloud native on non clouds, you inherit their lack of foresight.
Google Cloud seemed to be in a forever beta state. It was not uncommon to find out that the sdk version I was using was no longer working so I had to update it and of course the new version had different flags with different configuration files. Just a like start-up/beta product. The worst part was if you got caught in a locked-in/proprietary product(i.e google datastore) because there was no way to get out without massive costs(i.e you can't install google datastore on a compute instance)
I have spent a significant amount of time on each and would suggest it's the only actual cloud. The others are data centers masquerading as a cloud, notice when us-east has issues for AWS, Azure had a spof dependency on a datacenter that didn't even have AZs... GCP is architecturally on another level. The others seem to be unaware of what 'cloud native' means, so if you are attempting cloud native on non clouds, you inherit their lack of foresight.