In general, but this is not Cloud or Pixelstreaming specific, your are normally GPU bound. This means you would need a Strong GPU for Realtime graphics.
For AWS, if you only need a few instances you can spin them up by hand very easily and just connect to them via Windows Remote Desktop to install and start everything. But i think this will be the same with the other providers as well.
If you not planning to make a huge scalable platform it does not matter that much what provider you choose, i would go with AWS or GoogleCloud.