Clarisse 3.0 (Pegasus) introduces a new point_uv_sampler geometry that samples the UV values of the geometry support in UV space which makes it much faster and way more efficient than the point_cloud that does this evaluation in 3D space.
point_uv_sampler is not meant to replace the point_cloud.
As already mentioned the point_uv_sampler samples the UV colors of its geometry support in 2D space and as a consequence it can’t take any other scene object than a single mesh as geometry support unlike the point_cloud that can use a combiner.
This is the flip side of the 2D space evaluation but its advantage is that the point_uv_sampler will be much faster in evaluating its density according to UV colors.
Unless you really need to use combiner or any other scene object than a single mesh as a geometry support, the point_uv_sampler brings a significant gain of performance.