Different strokes for different folks mostly.

Arch is a rolling release, meaning everytime something changes in a package or dependency, there’s an update.

Mint is a stable release, and gets major updates every few months, with much more frequent security updates, but yeah, it’s not an everyday thing like with Arch

While I don’t like saying “this is better than that”, since Arch is a rolling release, it’s always up to date, and so you’re not going to end up in a situation like “my built-in laptop sound card isn’t getting picked up” (i mean, you might, but it’s rare. After all, Arch can break sometimes times, just like everything, really) like you sometimes can with Mint and other stable distros. Also, Arch–well, vanilla Arch and something like Endeavour–comes with just the basics and everything else, you gotta add. I personally like this because I like knowing exactly what I’m installing and having only what I’m going to use…and also not deal with messing with PPA’s. This isn’t a point against non-Arch distros or anything, it’s all just personal preference–but really, everything from “Should I do Arch with Cinnamon or something like Mint or Fedora’s Cinnamon Spin?” is all up to personal preference