In a nut shell, I mix DO droplets with AWS S3 storage. I have found this to be the most cost effective in my line of work. Azure's strategy is enterprise and unless you are a heavy into the Microsoft ecosystem, personally I have not found a reason to look in that direction yet.

Since you have a JavaScript stack, I would stick with DO. Any other Cloud provider would mean you fiddling with the infrastructure of the stack for your JS projects.