Deathwatch is very fun. Especially if you get a bunch of conflicting chapters in your kill-team. Like Space Wolves and Dark Angels. So much fun haha.
Ultramarine & Minotaur ^^ But funny I bet are also strangely close chapters like Blood Angels & Mortifactors (mortifactors have different blood rituals)
I volunteer as a player XD (someone needs to help me because I have no idea how to create a character lol )
I actually have all of the Deathwatch Rulebooks, So I can supply them to those who need them I refuse to GM though. I am not experienced enough!