Bandamp allows you to purchase music directly from the artist, in high quality, and download and own it permanently. They also let you stream it from them after purchasing it which is a useful bonus but the main thing is you own the music.
I discovered Bandcamp while trying to buy music by Hatari a few years ago and have loved it since. They have definitely done things right and the ability to discover interesting artists there is just an additional perk.
I buy stuff from Bandcamp, download the ALAC, and then iTunes Match automatically adds it to all my computers and phones. It's not an either/or proposition lol
I used to use iTunes Match but now it syncs through Apple Music’s iCloud syncing feature. It’s the one thing that keeps me on Apple Music instead of Spotify because there’s a lot of live stuff I’ve got from Bandcamp and demo stuff from Patreon that aren’t on streaming services and would be a pain to sync manually.