I made the switch from AWS to Azure prior to being signed up with BizSpark. And from my experience is a a whole lot more bang for your buck for what you get even it you're just spinning up a bog standard VM. And might I add the AWS micro instance is pretty useless for anything besides having a tiny play. You'll never even have a test site working properly on t1.micro.

The other thing that swung me is the managed scaling for database and IIS in Azure where you just tweak a slider to allocate CPU's as required. Note this works for anything that can run on IIS such as PHP or Node or whatever not just for ASP.NET.

Now with Bizspark (and albeit fairly insignificant traffic for my startup) it's lots of bang for no bucks.

At least for three years until we get any decent traction and will get vendor lock in with MS and get stung by massive SQL licensing costs.

I know there's a lot of bad image for M$, but I honestly and optimistically believe that "Microsoft <3 Startups".