both of the planes are very good fighters although the russian Berkut is still a prototype
the US gov is making the raptor seem like it is the best plane in the world but its not
i doubt it has the stealth that they say it has and if they both went up head to head then the berkut would still probly win
then agian its the pilots ability to fly that affects everything
me and my dad went to an airshow where they had an F-4 go up agianst an F-15 in a fake dogfight
the guy in the F-4 was an old Korean war ace and won