Alright this is a pretty hard one because,I have played both of these great games and both have good graphics,awesome game play,and a nice story to tie it all up.In all honesty I would have to say Call of duty 4 takes my plate for the online multiplayer.(although Rainbow Six Vegas 2 is awesome online)
well this is a hard one...both have custimizable weapons and great online play..cod has better graphics but no player custimization wich realy sucks..both have great online play. im gona have to say rainbow six for the custimization and the online play is just as good as cod4