FYI. My Tower dual-boots Manjaro [KDE+Cinnamon; SSD] with Fedora 30 [KDE+GNOME; HDD]. I created an additional 60 GB partition on the SSD for DATA, which i share between the boots. This includes all my Documents [for which i use LibreOffice & Okular], my Music Pictures Projects Templates & Videos directories, my VPN config files, my bash scripts, my VM Share directory, my
.thunderbird directory, & my
.config subdirectories for
Task Coach. All those DATA subdirectories are symlinked back to their original locations with the
~/home directory of each boot.
~/home directory contents not specifically listed above, remain in their original locations in the individual respective boots.
I had also intended to move all my browser directories into DATA as well, but i encountered several practical adverse consequences from that, so i ditched it.
I absolutely earnestly recommend, fwiw, that you never ever attempt to share the actual
~/home directory itself between different distros, for reasons already canvassed by others above.