I don't really need a definition of success, but I'd say a society that has a high chance of survival, has minimal suffering, and creates beauty. Given all tho

I don't really need a definition of success, but I'd say a society that has a high chance of survival, has minimal suffering, and creates beauty. Given all those things being equal, certainly a higher population would be more successful. However fast population growth is likely to work against most of those goals.