Halo3 or Orangebox

Well, im planning to buy a game later for 360 and im wondering whats a better pick up. Halo3 or Orangebox, ive read gamespot's reviews on both games and i just cant decide. I just want to know which game has more people online playing it (XBL)

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i like team fortress 2, just afraid that not a lot of people will play it online

so halo3 perhaps? for online play?

I bought orange box mainly on hype from friends and reviews li 3 days ago and i dunno if i should have.

I mean yea its a great deal and everything but i dont really see myself playing it for very much longer. I never played Half Life 1 and i bought half life 2 when it hit the backwards compatability list and i ended up playing it for like an hour and just hating it's plodding pace. Right now im doing the airboat sequence in HL 2 and so far .. the game is pretty boring to me.. I'm gonna stick with it cause i know it will get alot better but to me so far the hype doesnt live up to the purchase, Halo3 brings me so much joy for my 60 bucks its crazy.. i cant remember buying a game and getting so much satisfaction from it in everyway, I play a couple of games of TF2 and although very cool looking and different.. i dunno how often i will be playing that game. I hate getting instantly booted out of matches after they are over that is so annoying. I dunno i mean its a good game but i dont know if it deserves all these accolates. I'm gonna beat it and give TF2 a chance but i dunno i feel that in about a week or so im gonna end up selling it on half . com and buying Conan, PGR4 or maybe just putting a reserve in for Mass Effect. Just my own opinion thou of course.. i know there are some rabid half life nuts out there and I'm not trying to start a nerd war here just giving my take.