Ok I'm quite far into the game now but have yet to chose which side I'll take (Stormcloaks or Imperials), may not pick one at all if that's a possibility. I'm just wondering though, does joining the Dark Brotherhood or Thieves Guild affect how either of the two factions above react to you?
Also, I'm taking the paragon route so does that mean it's counterproductive to join the thieves or the brotherhood?