Our biggest concern is a reliable replacement for RDS-postgres, which we've been using for about 13 years now and has been rock solid with the exception of a single, short period. Even then it was an update that caused high baseline CPU usage and AWS had it fixed in a few days.
Cost isn't the primary concern - though lower costs would be a nice side effect.
Shopping list:
- Good OpenTofu (or Terraform) support
- Reliable
- Good managed database (we could roll our own here if needed, I just don't wanna).
- Canadian DC
Nothing we do requires high performance or anything vendor specific. We also roll our own o11y and don't use AWS's vendor-specific solutions (at least not primarily).