Both
I use both Milwaukee and Dewalt. Milwaukee 12V tools (hammer drill, Hakzall, Brushless impact, 12V oscillating tool). Dewalt: I use the 20V cordless vac for clean up (works great and no cords to worry about). I also have the brushless 20V max drill and it has not failed me once. Everyone says that having two brands of tools is a waste because of the batteries being different. In my case though I have no problem using both brands on jobs. So no problem here using two brands, regardless of the majority of people sticking with Milwaukee. If you use something and it holds up with the work you do and makes you money in the process I would say that you are doing something right.