Very anectodal, but some things are better on Azure, because they were late to the party, for example azure blob storage. It costs the same as s3, but it supports journaling, so you can do journal archives. You can run your main thing on aws and keep backups on azure. If you wanted backups with journaling on AWS, you'd have to use EFS at minimum, which is orders of magnitude more expensive.
For example AKS (azure kubernetes service) has been problematic for us. Similarly AWS RDS is much better than Azure PostgreSQL offering.