The Lion is comparatively more Bigger in Size than a Lioness, so it will be more Stronger in comparison to a Lioness ! read more
Physically the lions are bigger and stronger than lionesses. But if you talk about power, then it depends on the context. A lion needs to be strong to maintain a territory, fight with competition and have a pride. But a lioness can be as powerful or even more than a lion, if the need so arises. read more
At the same time, I think that the male lion is more selected to be stronger as the only males that can reproduce are those that are strong enough to kill off pride male leaders. But also the female lionesses are more selected to be strong enough to hunt in groups for their pride. read more