AWS offers a wide variety of services - just look at all of them on the AWS Console, they can barely fit my screen. It would be more appropriate to compare a specific service, say EC2 with DO. We (backendless.com) have done a similar comparison about a year ago when our EC2 bill started sky rocketing - we run a rather large server farm. After doing all the due diligence, we decided to migrate to OVH.com and saved between 80 to 90%.