If you mean dark heresy, my vote is both... which i'm about to get back into

started out in
DH, Worked our way up to rogue trader, and now my character has been accepted into the space wolves and so we'll be using all 3. It really depends on what you want to play.
DH was full of investigations and intrigue. But combat was... dangerous. very dangerous. you attacked from ambush, or got the hell away from the fight if you could (not my character though...) Rogue trader upped the power
lvl and made combat a bit more survivable, but barely. We starting using our cover as a rogue trader more so less investigation and more trading. still lots of intrigue. Deathwatch... oh am i looking forward to playing that