Louis I. answered 06/01/19
Computer Science Instructor/Tutor: Real World and Academia Experienced
I wouldn't make that statement ... both Amazon and Microsoft take their security / performance metrics very seriously. Azure is currently number 2 in the space to AWS (albeit a distant #2).
I think choice comes down to what an organization's enterprise architecture is all about.
If you're mainly using a .NET development stack to build systems, you'll likely gravitate Azure.