I can try, but I don't own Irelia yet and don't play the other two you mentioned too often. I can still give you builds, jungle routes and basic theory that can help your laning phase and team fights.
If you're looking for more expert help you might have to look elsewhere for Irelia and AD carries. I can give you the basic 1400+ player level of help though.
If you're looking for more expert help you might have to look elsewhere for Irelia and AD carries. I can give you the basic 1400+ player level of help though.

Thanks to Jovy for the sig!
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W does more base damage, more end game damage, is short cooldown but you have to get close for your ennemy to hit it.
So yeah it depends on the matchup and the utility you wanna have in a team fight.
(Q behing better because it's aoe + long range in team fight)