Personally, I have one of each. I bought the Badger first. It is easy to break down and clean, but I spray acryls a lot. The needle is prone to choking (as is any needle) with acrylics. I then bought the Aztek, and since I've not touched the Badger, honestly. The Aztek kit I bought came with a number of needles and paint cups. A number of the needles are similar in size, so when one chokes, I change it for a similar clean one. Changing the needles is quick and easy. As Don Wheeler pointed out, the trigger can be squishy, that's cause Aztek allows control of the airflow and paint flow. You also have to 'dial in' the brush at first, for paint cutoff. They include a 'very fine' plastic red nozzle with some of their kits. Avoid it, it's nothing but trouble and chokes up instantly. Personally, I find it nicer ergonomically to hold onto, the variety of needles cover every usage, the different sized paint cups are nice. The one tool I did buy to help clean it all was an ultrasonic bath that I found online. After a paint session, I disassemble the nozzles, drop them in for an 8 minute bath, and reassemble. Once a week I drop the entire brush in for an 8 minute soak.
For me, the Aztek was money well spent. As previously mentioned, it's a matter of personal preference. Ergonomics won't really matter for brief paint sessions, for longer ones they will. A kit with all of the nozzles included saves having to purchase separate nozzles later on, and simply changing the tip is a lot quicker and easier (and far less risky, I find) than pulling the needle, nozzle, trigger and air valve actuator, then reassembling it all.
My two cents, at any rate.