Think I’ll go with Mint on one drive for school and such and on the other drive Arch for gaming
Nothing exactly wrong with that but I don’t think you’ll need the extra layer of separation. Most Apps on Mint should be available Arch as well and run generally as Bug free as on Mint (Edit: a “graphical” representation of what level of Bugginess you can expect: Many Bugs > Some Bugs > Few Bugs > Windows 10 (personal experience) > Arch Linux > Almost no Bugs > Linux Mint > No Bugs). Not splitting the OS would save you some hassle (for example after school work is done you can start gaming faster as well as simpler disk partitioning) on the other hand depending on yourself it might offer advantages (can’t get as easily distracted from schoolwork with games if you have to reboot the PC for it)