Typically AWS is cheaper than the other majors. Some of the minors can be cheaper if you don’t need all the bells and whistles. AWS’s free tier is incredibly hard to beat for tiny hobby things and learning. At enterprise scale, you really have to go with a major over a minor if you need volume. The minors fit best for a very specific, smaller niche that will never allow them to grow enough to take on the majors.

I have only ever found AWS to be stupid expensive for new things before they get called out for price gouging.