I think Fedor emelianenko had a better armbar because he performed them from different positions. He is more well rounded and she is a one trick pony.

Fedor Emelianenko

Emelianenko did

Sigh..are you obsessed?!..Ronda Rousey as said is a one trick poney..and as soon as she faces someone who can defend her takedowns and has good standup..she will get KTFO!