Just figured I'd ask to get things rolling, personally I think they're both pretty great games though HK takes the win for me due to the enormous amount of dialogue options that makes it feel like I can really get to know my team and even some of the random NPCs. As well as slightly more gear to play with due to being more recent.
That said I've heard Dragonfall (and maybe returns) have better mod support for projects such as shadowrun Unlimited? Which is still being updated as of July this year.