Honestly there should be many more types of splatting imo...
Beta splatting seems pretty promising. It addresses the fuzziness aspect of gaussians among other things.
There are various papers on variants of Gaussian splatting (keyword "differential rendering") which replace the Gaussians with some other explicit geometric representation that can also be rendered in real time. A triangle soup is just one example. I recall one which uses some sort of tetrahedral foam instead.