If you are not favour of big brother Amazon Web Service (AWS) or Google Cloud Platform (GCP) due to its complexity of the service offerring, you might be end up checking out other Cloud Service provider like Digital Ocean, Linode, Vultr or any other provider out there.
For us, what we are looking for is a simple to use cloud platform to be in range what technology we want to use only. Indeed, AWS offer a great deal of API even they have a robotic arm API, IOT Api which i attend its demo during the Tech In Asia 2017 which held in Jakarta. But at the end, you are going to look at what you really want to use.
Anyway, this guy here made a comparison of a few provider. But personally, i love Digital Ocean more. 🙂
Check out this link : https://joshtronic.com/2017/02/14/five-dollar-showdown-linode-vs-digitalocean-vs-lightsaild-vs-vultr/