I used to use SQS but Postgres gives me everything I want. I can also do priority queueing and sorting.
I gave up on SQS when it couldn't be accessed from a VPC. AWS might have fixed that now.
All the other queueing mechanisms I investigated were dramatically more complex and heavyweight than Postgres SKIP LOCKED.
https://aws.amazon.com/about-aws/whats-new/2018/12/amazon-sq...