I noticed Amazon is now marketing a streaming service which claims to deliver an HD product, meaning high definition I suppose. They also deliver an ultra high definition product. WOW, who wouldn't want to sign-up for that? Other streaming services make similar claims; and, apparently, folks are drawn like moths to a flame to get what they perceive is a better product than what iTunes, the market leader, delivers. At any rate, since buying an OPPO-205, which permits me to enjoy 24/192 downloads I've placed in iTunes, I've had the ability to contrast and compare these highest quality recordings to the same music delivered from Apple Music in AAC and I find that, for the most part, I can not distinguish the 24/192 material sounding better in any manner better can be discerned, from AAC. This revelation has caused me to re-think the need to spend for 24/192 over much cheaper AAC downloads, as well as be persuaded to drop my Apple Music subscription for a more expensive spread. The bottom-line for me is iTunes/Apple Music satisfies and perhaps that's in part to their mastering for iTunes process, which I thought some here might want to read:
https://www.apple.com/itunes/docs/apple-digital-masters.pdf