Avoid Manjaro, if you plan on entering the ArchLinux space do it with EndeavourOS.
I would avoid Ubuntu, but that is more because I dislike their politics on snaps.
You are an entry-level IT pro, so, I'd suggest EndeavourOS for personal, Debian for work. Why? Simple, Debian is widely used in professional environments, nobody will look at you weird for using a "less professional" distro.
In terms of University work, you are saying you guys use Teams and Office, probably with a student license that would give you access to a full online Office experience through the browser, just use that.
In terms of gaming, things are looking pretty good nowadays, and with a more personal distro, such as EndeavourOS, you'll get the latest advancements in gaming.