Azure has its flaws but Microsoft puts a lot of people and effort behind it . We are not that large but there are so many instances where Microsoft reps will come in call with our customers or their people working with common customers will help out etc.
AWS has a done a decent job of taking enterprise business seriously last 10 years. you can get human support but generally they will charge you , I.e if better support you want you have to pay for premium support plans .
They are constrained unlike MS they don’t have non-cloud large enterprise business relationships for decades M365 or AD etc that helps with building the enterprise DNA.
In all three clouds it works best if you don’t buy directly, buy through a partner reseller , who both have the relationships to the CSP and have the people to work with you .