Well the question is kind of worded incorrectly, since Bungie isn't working on Halo at all any more and it's only 343i....but I know what you mean. The answer to who has done better with the series is Bungie, hands down and no doubts about it. 343i's run with the series has been nothing but garbage (story would be fine if it wasn't Halo and were it's own series or something, it's [i]just[/i] as Halo that it sucks big, hairy donkey balls) and isn't even Halo. So naturally Bungie is better by far...though that kind of goes without saying since it's [i][b][u]their[/u][/[b][/i] creation and series to begin with. 343i has no -blam!-ing clue what they're doing and they're only taking Halo further and further away from what it is and turning it into a simplified mockery of itself >_>