IF you can find the song you want on Tidal, they have some actually very high quality tracks as FLACs

There's also some services out there that let you rip from Tidal as well as other platforms ;)

Tidal, Qobuz, NetEase Cloud Music, Deezer, Apple Music

Everything you mentioned is garbage

The highest quality on youtube is about 128K AAC or OPUS. Spotify and Soundcloud have 256K AAC, but only with a premium membership.

Why not pick a few songs available on each platform and listen to them yourself?

Honestly, it'll depend on what was uploaded either way. A crap version could be uploaded with a very high bitrate, and an excellent version could be uploaded at slightly above average.

Unless you have a very nice DAC and monitors, you're probably not going to be able to tell the difference between average and excellent versions anyway.

Anything that isn't mp3. I'm actually stunned people still use that codec. Willingly. AAC is just far superior. ALAC/FLAC for lossless can get quite large. Then there's the gorilla in the room: do most of these songs even get resampled properly when a new format is released? Atmos is all the rage but a lot of songs from the past that are now available in the codec sound off because the separation of instruments and sound is so far away from the original.

Your current system probably sounds like music from 1998, muddled and drowning in bass.

Try Qobuz. The have the best quality most of the time

Here is an alternative Piped link(s):

https://www.piped.video/watch?v=WEJ_m2HPXv8

Piped is a privacy-respecting open-source alternative frontend to YouTube.

I'm open-source; check me out at GitHub.