Sometimes these forums reminds me of the arguments we got into as kids... my dad drives a Ford and his car is better than your dad's Chevrolet. The only way you are going to make a good decision is to try the hammers out for yourself. There are real pro's and con's for all of the brands of hammers that are out there. Striking power, purchase price, maintainability, reliability, controllability, service by the distributor, and I am sure there are other factors. Personally, I would go with a self contained hammers... those are the hammer designs that are used in industrial production shops around the world... for over 150 years. I have used both external compressor hammer designs and self contained hammers and I like the hitting power of the self contained... but then my dad's Ford was better than your dad's Chevrolet.