Are you Sergeant Johnson or a MKIII?
http://youtu.be/clPN7bZkIZA
http://youtu.be/5kcpJzmwWwA
[spoiler]ODST is bad arse so is Halo Reach![/spoiler]
[spoiler]Reach haters go to iamamindlesssheep.com[/spoiler]
[spoiler]Hell jumpers![/spoiler]
[spoiler]MKII![/spoiler]
[spoiler]#Inb4lemonsaysreachard[/spoiler]
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ODST was more challenging/rewarding but Reach was more diverse and over-the-top. I'm gonna have to go with ODST, though.