I use all barbells for my chest work, for the most part, aside from dumbell flies occasionally. As stated, dumbells give you an extra range of motion. There are bars with an indentation in the middle for this purpose though, but most people dont have access to them at thier gyms. Ive never tried one of those bars before, but dont really see the point. The flat bench is deep enough for me as is. Any deeper, with the weights Im using, Id probabally injure myself alot sooner. The dumbells also use more stabilizer muscles as well. I like that I can put a much heavier weight load onto my muscle with the barbell. I also dont like to waste energy throwing up heavy dumbells, since I like all my focus to be on the lift itself. I like seated dumbell shoulder presses though. I used to do those alot. Some people do well mixing both into thier routine. Ive also never got sore with the dumbells for some reason. I havent tried dumbells for chest in a long time however. The other reasons I havent added them into my routine lately is they seem to put alot of pressure on my rotators, especially getting them into position. My shoulders feel safer benching! The other deterrent is, I have a scar on my hand from stabbing it with a butter knife. haha Was trying to seperate two frozen hamburger patties some years ago. The scar is thick and when the weight pushes on it, it sends pain through my hand and weakens my grip. Its not always a problem, but seems to be most of the time. I have to get the dumbell in my hand just right, and thats difficult with 120+lb dumbells. So,Ive learned to work around certain things. Id like to add them into my routine again eventually.