.SOG is a partitioned format with LOD support, thus it is designed for massive gs3d scenes. SPZ is has neither of those features, and thus is simpler. Given that ThreeJS itself doesn't yet support partitioning and LOD for its gs3d data - although it will come eventually - I figured that SPZ was a good fit for its initial capabilities. SPZ also has wider support right now compared to SOG.
Gaussian splat models are fairly imperfect on average.
If you turn off performance mode this is way higher quality than either of the other two versions of this model linked by bhouston in this thread, although with a much lower frame rate on my phone of course:
https://superspl.at/scene/56155c3f
There is even a link in the ThreeJS example preamble to this scene. I didn’t realize there was multiple lion splats of the same scene flying around.