Always the latest and greatest KDE applications und OS updates based on a rolling release (but the core is Ubuntu Xenial LTS). I guess there is no easy way to migrate a whole macOS system to a Linux based one (like having a iOS app that states "Click here and all data is being migrated to iOS from your old Android phone")
I would recommend Elementary OS to non powerusers because of the easy look and feel. KDE neon is also based on Ubuntu (Xenial LTS) but has way more stuff and tweaks. Just try both