Wild Dogs >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Lion, Tigers and Leopards. Wild Dogs success rate is ridiculous.
Generally speaking, I think that Lions have to wait for migrations to even get their shot at hunting. On top of that they have competitors like Cheetahs, Crocodiles, Leopards, Hyenas, Wild dogs, etc. So Lions have a lot more competition for prey than Tigers, so prey is usually healthier and a lot more skittish.
I think that Tigers are usually ambush hunters and they usually live in the same territory with their prey.