I've been kickin' it with Final Cut Pro on an M-series Mac and the speed + stability has been bonkers good, I'd recommend it!

This was the movie that made child me realize there were bad movies and misleading advertisements for those bad movies

I've been using Doppler. It has a Mac app and an iPhone app that can sync together over wi-fi or a cable. Super clean, fast, no subscriptions or contemporary software nonsense. If you have the hard drive space, you can add as many songs as you like. brushedtype.co/doppler/