For example Rethink Priorities looked really exciting when it got started with their co-founder expressing strong support for practical prioritisation research. But their research has mostly focused on animal welfare interventions, not on comparing between causes.
For what it’s worth, Rethink Priorities’ research on sentience and capacity for welfare can be used to inform us how to prioritize between interventions for nonhuman animals and interventions for humans. Charity Entrepreneurship has also done research comparing animal welfare under different conditions for different species, including humans, and Founders Pledge has done a sensitivity analysis comparing the Humane League and AMF.