Originally posted by Glocninez
HQ does give quite the amount of experience. My main XP grind game mode is Kill Confirmed though.
This is correct.
Treyarch removed some aspects of HQ in this COD. The main thing being that you don't get XP for holding the HQ.
Kill Confirmed is still the way to go. During double XP, if you collect 20 tags, that's 4000 points alone, not counting points for kills, medals (at the end of the game) Match bonus for killstreaks, denies, assists, challenges, etc. Games are also shorter. You can play two KC games to one game of HQ.