Comedy = Sallu
Romance = SRK
Action = while most people will say Salman but how can they say SRK is nothing in action and some even rate him 0/10 lol, it's hilarious, i mean how many action movies has SRK done compared to Sallu, i guess movies like Don, Don 2, MHN, Baazigar, Raees, KA does not count, or even CE. I'm personally fond of Don 2, slick & stylish action, see that movie and rate his action 0/10
So i will say both are almost equal, while Salman is more prolific due to higher frequency of action movies, movies like Don 2, DON, MHN, RAEES and even CE has proven that SRK's no slouch either in action.
BTW did i mentioned that SRK is way ahead in humour department in real life, just can't figure out what happens in movies though..??