I don’t use a separate /home, I have a partition > /my shit < that has all my stuff like > /my shit/movies < and > /my shit/music < /my shit/kde < etc....
/home has settings that can be os dependent/package version dependent. I have seen some messed up things with /home, especially mixing one from a different distro or using one spread out across the system using many distro's.
Just not worth it to me.
The problem using /home from a "stable" version to a "rolling release" version is asking for trouble imho (.kde, apps, config, etc.) different version number of apps (stable, ubuntu would be much older), dependencies (stable, ubuntu would not be up to date, etc)
Installing a /home is like driving a ford pinto.
The whole key is to know what configs are important to you and back those up, saves space, time, headache. Kde is very easy
To be honest, if it was anyone else I would say "In the end it's your choice" but, with you, you better do a lot of reading on the subject, were not the Beatles here, were not going to hold your hand