Realistically it depends on the individual.
Tigers aren't far larger than lion to completely overwhelmed them, both are pretty similar in size.
Some Lions are bigger than some tiger and vice versa
Bigger wins over smaller generally.
Which means not every full grown adult Amur/BengalTiger will beat every full grown African/Atlas Lion
If we take similar sizes of same experience + both prime age, then Tiger has an edge. Better in ground game, faster reaction, more athletic/flexible, ability to used hind legs, bite force, claws, teeth, swipe etc. The tiger fights like a house cat i.e using all of it's body parts efficiently. Lions are brawlers, their endurance, tenacity and stamina are their main power over tiger. But Tiger advantages outclass lion advantages especially both in same weight division.
That's why only if the specific Lion is bigger than the tiger( at least 20-30kg difference), Lion would generally win.
Otherwise tiger.
And if we talk about general as a whole, than Tiger are generally bigger than Lions tooon average, so again Tiger simplistically.