If I want the highest quality streaming, then Amazon Music.

Otherwise, things I’ve purchased in 96khz or 192khz from ProStudioMasters.com

I work in the audio post industry, so I’m generally listening on my work rig either through Genelec speakers or Beyer DT880 Pro headphones, fed by a UA Apollo audio interface.

Spotify -> MOTU M2 -> HiFiMan Ananda non-stealth

“High resolution” audio is completely useless for listening (16 bit 44.1 kHz is the best it gets) and there is little value in lossless encodes for listening purposes too, so I don’t get the point of all those “Hifi” streaming services.
If you own lossless encodes, I guess it doesn’t hurt to use them even for listening as storage is cheap these days.

Speaking of which, I’d like to switch to purchasing my music though because Spotify will certainly continue on its path towards full enshittification. I want to be in a position where I own all my favourite music before Spotify will be infected with ads on premium plans. Oh and artists are somewhat more likely to be paid a little for their work that way (I hope…)
I plan to use the free YT music for discovery at that point.

NAS -> ALAC, high-res files -> Plexamp -> Sound Blaster’s recently top-end sound card (name?) -> Schiit Heretic amplifier -> Sony MDR-1ADAC headphones

Or

NAS -> ALAC, high-res files -> Nvidia Shield (via Plex) -> Yamaha RX-A8A receiver -> Polk Monitor 70 tower speakers

I buy it if I can find it on a platform where the money is actually going to the musician. Then, I upload it in CD quality FLAC format to FunkWhale, and also add it to the SD card in my DAC (a Shanling Q1). Where it’s convenient I listen on the DAC, where it’s not I stream through FunkWhale.