Animals usually have more physical prowess so if it was a fight to the death, I would bet on the kangaroo. Take a look at chimps. They're 5 times stronger than the average human due to muscle insertions that give their limbs greater leverage.
Now, the thing that sets us apart from other animals is the use of tools as weapons. Intelligence is what defines humans, not mere physicality. The 250 pound caveman would crush the 130 pound caveman 99% of the time until the 130 pound caveman learned that he could pick up a sharp rock and bash his 250 pound adversary's skull in.
Most people would get torn asunder by a 1,500 pound kodiak bear, but give them a semi automatic .308 and that person will have a nice new rug.