If you are going to be treating your server as a pet (server down services down) and not cattle (node that can disappear) you are going to want to stay away from images hat require a reboot to update.

Assuming pet based on limited context.

Debian stable or testing as the most "cutting edge" is what I'd suggest but ultimately any package updatable stable lifecycle distro you are comfortable with will work. Most of what I do is use debian stable and docker to run all the services which you can on basically any distro.