Is it best to build my library in serato or engine.? I’m confused as to which I should use
With the star rating back in the IOS version of iTunes, I would consider using iTunes again. It does takes some getting used to, but it will then give you access to your track from any DJ software, including Engine, RekordBox, Serato, Traktor, Cross, DJay Pro, VDJ, etx.
Just be sure not to use that Apple Music sync option. It will wreck your collection.