Big survey! (which isn't a mastodon survey due to the amount of possible answers)
What linux distribution or operating system are you using in your work environment?
you can list what you use:
- on your workstation
- on the servers
- inside containers
I'm very curious, my bet would be for a majority of Ubuntu/Debian, but surprise me 
Note, I just retired, this is as of a month ago:
- on your workstation
RHEL v8, but I heard v9 will not be allowed and once v8 is EOL, you need to use Fedora or Ubuntu.
- on the servers
AIX, but when I left, a move was being done to RHEL on mainframes partitions
- inside containers
No Linux containers, but it will be RHEL on mainframe partitions
Solène 
jmcunx