Arch should be fine for university stuff. The main problem with Arch is not Arch itself, but all the software it tracks being very fresh. You’ll be pulling updates as they come down the line, and that may result in temporary bugs or day-to-day workflow changes - caused by the software developers themselves. I don’t think an Arch system is unusually unstable or prone to breaking, but last year they did brick everyone’s GRUB loaders by pushing an update too early (post-mortem here). It’s up to you, but if you want to err on the side of system/software stability I would go for Mint/OpenSUSE Tumbleweed/Debian.
I don’t have any practical experience with EndeavourOS but TMK it’s just preconfigured Arch and it uses the default repos, so that sounds good to me. Vanilla Arch is not inherently better or worse, it’s just a more minimal starting point.