My DX is a very nice tool. That being said, it is more of a digital tool (logic) and has a very low sample rate for analog work - 24msps shared between digital and analog. You have to buy the additional "suite" software to get even basic analog triggering. Although the software is pretty, it is not so intuitive to use.
The QX is their new one which seems to be more of a real tool. I don't know if it is easier to set up and use, but to me the software looks the same. One other thing about the software is that the suite tool is the only app of theirs that is all together integrated which kind of limits it and complicates it all at the same time. (if that makes sense) All of the other individual functions (i.e. scope mode program) are separate applications.
I really like the Pico software a lot better. It has advanced triggering capability and a host of other features that you find on bench scopes like masking, decoding about everything, and persistence. It will run in demo mode without the instrument, including the function generator, so you can really get a feel for how well it works. There are also a ton of youtube videos especially showing how to use it for automotive troubleshooting.