For those of you into watching YouTube reviews with a grain of salt, here’s a recent one (Tharbamar) that compares the Eversolo DMP-A6, the WiiM Pro (unfortunately not the better Pro Plus), and the Matrix i4:
3 Best Buy Music Streamers Comparison, EverSolo A6 vs. Matrix i4 vs. WiiM Pro - YouTube
As for Spotify, I simply got tired of being lied to about when they were going lossless with at least CD quality. I’ll never go back to them, even if they offered it for $1/month. Their bait and switch kept me on lossy Spotify needlessly for a year.
While we’ve been discussing these streamers and more, there are the NAD CS-1 ($349) and the Cambridge Audio MXN10 ($499) which haven’t gotten a lot of press (so far) that might be worth a look. The MXN10 says, "Spotify Connect, TIDAL & Qobuz built in".