Takes more points of parry to equal one percent compared to 1% dodge.. ie like lets say to get 16-17% parry you need 60 parry rating, dodge 16-17% may only take like 40 dodge rating.

Dodge scales alot better then parry, and also on the note of defense, first getting defense capped is #1, then maintaining a ratio of 3-1 or 2-1 on your defense to dodge is optimal.
im in fury gear atm, but my warrior is like 28,231 hp's 24% dodge, 25% block, 17% parry rating and defense capped.