but as said, the most muscle and the most strengh are not the same thing, nether of you sibling have any muscle tone in their legs, so the guys legs have the most visible muscle and far less fat , fat legs are not strong legs,
all that said choking someone with your legs is quite easy, if you can get in position,,everyone's legs are stronger than their arms, and the size of the leg muscles are of no regard, its the strength of the abductor muscle that would count for squeezing the thighs together