Best practice on choosing Linux Distro for small Docker setup that might scale

I'm currently switching from being a web-dev to be a sys-admin. I'm trying to learn how to do things properly and was wondering how to choose the best distro "for the job". We are a small, 3 man (including 1 person from accounting) company. I always used Ubuntu on servers but my boss prefers Debian and some others say that they use Rocky. I'm currently in the process introducing Docker to my boss and he wants a (in my opinion) complicated/overkill setup with PXE boot, minimal distro (something like flatcar/alpine as the host), one external storage per container and other stuff to harden the system. I think a Ubuntu/Debian VM with Docker installed is completely fine for the time. What would be the right way to handle a small docker setup that might scale? Go all the way or use something simple?