Besides, you can never go wrong politically by saying I chose the vendor in the upper right corner of Gartner’s Magic Quadrant.
The technical reason is that if I want my hosting service to do more of the “undifferentiated heavy lifting” and provide managed services. I won’t get as much of an offering from Linode/DO. The last reason is that AWS Business Support is excellent. They’ve helped me out with some head scratchers and when I just didn’t want to figure something complex out myself. Their live chat is awesome.