* Black Panther is a Colour Variation: A black panther is not a separate species. It's just a melanistic (black fur) variant of either a leopard (Panthera pardus) or a jaguar (Panthera onca). So, we're actually talking about the abilities of leopards or jaguars.
* Size Matters: While a large leopard or jaguar could potentially kill a smaller lion or tiger, it wouldn't be a guaranteed win.
* Fighting Styles: A tiger's size and strength, or a lion's mane and social hunting strategies, could give them an advantage.
* Environment: The outcome of a fight would also depend on the terrain and the animals' familiarity with it.
In summary: A black panther (leopard or jaguar) is a powerful predator, but it wouldn't automatically win against every other big cat. It would depend on several factors, including size, individual experience, and the environment.