Hammers can be damaged if the gun is dropped making the gun useless. It is also possible to get clothing, hair, etc. between the hammer and firing pin preventing the gun from firing in very close range SD situations. Striker fired guns have 1 less opening to allow debris into the action of the gun.
Trigger pulls can be equal with either type.
The only advantage a hammer fired gun has is 2nd strike capability if the round does not fire. But only on DA designs. Since the odds of a round firing on the 2nd attempt run less than 50%, I don't see this as much of an advantage. If a round doesn't fire, I'll be ejecting it and loading a fresh round with any gun rather than wasting time trying to make a dud round fire.