I'm hoping to start playing either Dark Heresy or Rogue Trader with my roleplay group and was looking for some advise on which one to get started with? Any suggestions are welcome.

Also

We are currently playing WFRP 3rd ed and the new dice system has been really simple for a bunch of new players to pick up. Can anyone give me an idea on how these systems work? Are they d20 systems? and how easy is a d20 system to use?

I know that the d20 question may seem odd but that's how new to roleplay i am. Go easy

Daeion