should i play halo odst or 3 first

stuff is difficult for me cause I want to play in chronological order but also I want to experience stuff the way it is was made so like I'm starting with ce and not Reach even though I played through a lot of it I'm playing ce first but with odst it seems close enough and it doesn't spoil (not that I know of) any of halo 3 and I played some of it and liked the gameplay and vibe of odst and I want to get to it faster and playing 3 then going all the way back in time to halo 2 doesn't make much sense for me.