I used to do dumbbell inclines, but then my shoulder started to hurt a lot. I think it was the movement of getting the weight from my leg to my shoulder.... THen i switched to barbell and i had NO pain and no problem. And, i feel i can push myself harder with a barbell.
But now, if i switch over to dumbbell sometimes, i dont get the pain anymore. I think i had to work on my shoulder strength / stability or something. But regardless, i enjoy barbell more.
-Fatty