320kbps takes more space that’s for sure. As for the amount of space, I’m not sure, but at least that I’ve heard, it hasn’t made that much of a difference when I used to import 320kbps songs into iTunes. I heard a difference from the low qualities to the higher bit rates, but from Apple’s current standard and separately downloading songs in 320, I seriously couldn’t tell the difference. Even though I’m an artist and want the best possible sound quality, I couldn’t see the benefit of going outside of Apple Music to get 320, so I stopped. Now I use Apple Music and it’s great.