I’ve always found the intelligence criteria for eating for not eating animals stupid (because I never thought of intelligence having relevance to ability to suffer) but the social metric is an interesting way of looking at it. I don’t think you can call socialness of a species something so related to the intelligence though, there are highly solitary species that are still very intelligent. Being kept in captivity would still be suffering for them, just for different reasons. I think the suffering of all animals matters but if I had to say between animals which one’s matters more I’m not sure I would differentiate by more than lifespan.