Liger would beat the Tigon and I'll tell you why too.

When tigers breed, the male tiger has genetics that limit the growth of the offspring and are more dominant than the females (who has no growth limiting genes), hence male tiger cubs grow no bigger than their fathers.

Similarly, female lions have the dominant growth limiting genes, hence why females grow no bigger than them. Put a male tiger and female lion together (a Tigon) and you have two sets of limiting growth genes and a hybrid by-product that grows fairly 'small' and is limited to around 400lbs

.



On the other hand if you couple a male lion and female tiger (each not carrying growth limiting genetics) the end result is a massive hybrid offspring, that NEVER stops growing and can weigh upto 1200lbs.



(look at the size of that head compared to the Tigon's)

As both sets of species have growth limiting genes, it's natures way of stopping the two animals from breeding with one another. Any offpsring of the two would be sterile (like a mule) anyway, hence why i think it's unethical to try and force breed the two seperate species.