I'm using KDE5 at the moment, and it's essentially problem-free. It's got more features than I know what to do with, but this somehow doesn't detract from it but rather enhances it.
KDE5 never seems to be the default choice of desktop environment for distros like Manjaro, but you're unlikely to go wrong picking it as your default option, if you're given that option.
KDE5 never seems to be the default choice of desktop environment for distros like Manjaro, but you're unlikely to go wrong picking it as your default option, if you're given that option.