You generally max Q first because ball positioning is very important and reducing the cooldown to reposition it often is very useful. It also allows you to constantly poke your opponent for a very low mana cost. Maxing W increases your poking strength and can be done when dominating your lane to just kill over and over.
I would suggest reading Khazem's guide: http://www.mobafire.com/league-of-legends/build/orianna-mathematical-errors-which-im-about-to-correct-232223
It specifically answers this question for a bunch of matchups in the matchup section. I found that really useful. :)
It specifically answers this question for a bunch of matchups in the matchup section. I found that really useful. :)

Thanks to GrandMasterD for my sig!
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