Happy collecting.
If a site offers "MP3 320kbps" vs "AAC 256kbps" – pick the AAC. AAC is more efficient; 256kbps AAC beats 320kbps MP3 in blind tests. itunes plus aac m4a sites top
I recommend Beatport, Juno and Bandcamp for buying music files. The real ace in the hole for me is Qobuz. If you're ever looking f... Happy collecting