The Zidoo Z9X Pro, it's about the same price and supports Dolby Vision and Atmos in Kodi (they have their own build called ZDMC) and is generally faster then the Shield (USB 3, SATA, 4 GB RAM, etc.... ).
It doesn't seem to support the DRM protected streaming apps that use Widevine though (Netflix and the like) since I can't find them in the Google Play Store, which sucks, but I can just use the smart apps on my LG TV for that.
It seems that it's really difficult to find a STB that supports everything these days and doesn't come with shitty specs/is years old 😑