@klimt I've had/have 3 streamers - The HEOS streamer built into my Marantz integrated amp, a Node which I got for a bedside headphone unit while recovering from shoulder replacement surgery, And most recently a WIIM Ultra for my office system because I needed the EQ functionality. Honestly, all 3 are great. I tried multiple streaming services, and landed on Amazon music with the Ultra HD upgrade. Even using My HiFiman Sundaras, the differences between services was so small and so random as to be not meaningful. If I thought a track might sound a tiny bit better on Qobuz or Tidal, another might sound a tiny bit better on Amazon. And, since I'm already a Prime member, it was kinda a no brainer. In addition, Unlimited offers an expanded catalog plus Atmos audio mixes which are playable on Dolby Atmos soundbars, Android or iOS devices, and the Amazon Echo Studio. Since I have a Sonos Arc soundbar in our main bedroom, I get to enjoy Atmos there as well as in our theater. I also have a pair of Echo Studios - the worlds least expensive Atmos system, although they're not my favorite,
I am most impressed with the WIIM Ultra. What it offer for $329 is simply mind boggling, I like having a display, and the headphone amp is adequate for my very hard to drive Sundaras. The Node required an outboard headphone amp to be usable, My Marantz amps headphone amps are also adequate,
Pro Tip: whatever streamer you decide on, They all use your phone or tablet as controllers. Consider getting a simple Android tablet as a dedicated controller, so you don't have to rely on having your phone on hand at all times. Alternatively, you can integrate the WIIM with an Amazon Echo for hands-off voice control