Both..change them up..for example..sometimes I do Incline barbell and then flat bench dumbells..and then another time I do flat bench barbell and then incline dumbell.

With barbell movements you will find that you can go a little heavier...but you range of motion is not a far on the negative as it is in the dumbells since the dumbells are not stopped on you chest liket the bar is.

I combination of both IMO is the way to go.