When the base game released, I was in the unique position to play it all in a few big chunks of time. Right now, I don't have as much time to spend with Dragonfall, but I can already tell it's the superior game. Most of the gripes we had with the original are addressed. You get quick saves now and there are a lot more choices to be made. While it seemed out of character for my Mohawk-sporting decker to convince a Cram addict to seek help, the decision earned my chick karma (which is important for leveling up) and proved to be a satisfying side-quest.
My remaining complaints have more to do with the Shadowrun universe than the game itself. I like fantasy as much as the other guy, but as I don't think it mixes well with cyberpunk I think I stand to enjoy Cyberpunk 2077 a bit more.
I may post more when I get the time to play some more. If you'd like to know more about the game, here's wot Rock Paper Shotgun thinks.