It comes down to this...... What would you get. Guitar Hero ||| or Halo 3? Talk about the topic. I will reply to MOST comments. If you already have one or both say so.
Its been done but w/e i dont care.

I already have Halo 3 and it's good. Guitar hero 3 is next though.
No doubt halo 3, got it on release day and have been playing ever since, best game i have ever played (online that is) online is the best part campaign is average.
MY gear
Vintage v100 les paul.
POS Ion strat
Vox ad50vt
15 watt practice amp
Ibanez rg570
I'm so sorry.

I've played both, single player and multiplayer, and I have to say GH3 is much better. Halo is completely overrated. Good, but overrated. GH3 gave me a lot more entertainment for a longer time.
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dude get guitar hero three beucase its the most expensive and just wait for halo 3 to get cheaper
i'd say GH3 because i've already seen the ending(s)to halo 3 and it's kind of overrated. kind of.
Epiphone Black Les Paul Standard with gold Grover tuners
Fender Mexican Electric Blue Stratocaster
Line 6 Spider Jam
Voodoo Lab Sparkle Drive
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Boss CE-5 Chorus Ensemble
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Cufk, TisH, Sips
If you don't have online, I would recommend GH3, but if you have live definitely buy Halo 3
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