In my vision SRK is the best actor because his body language is just near to perfect.AB has also a good body language but he uses the same style of his body language for all the rolls he plays.Instead of that SRK's body language is according to the requirqment of roll. However its true that sometime he too overacts just like AB.That's why SRK isthe best but not the perfect.

Well I agree that SRK is top now but he cannot be a replacement to Big B. It's roles and not rolls.