My solar installation crew uses Milwaukee and I don't like the drills as well as my Makitas. I use my 18v drill on a daily basis for my electrical work often for drilling 3/4-1" holes, I've worn one out already but am very hard on them. The Makita batteries charge quicker and are easier to insert and remove from the tool and I think they hold charges longer than thr Milwaukees.
I have several of the 18v Makita tools and love the performance and ergonomics of them all.