I think what you need to realize is as far as PvP purposes go, you need to decide one of two things.
First off is what is your play style?
-Are you a stand in one spot and dps or kite the enemy and keep on your toes player?
-Do you prefer to be able to kill the enemy as fast as possible, or sit back and do a steady amount of damage but have a much higher survival chance?
Each option provides it benefits, and this is true for the stats as well, PvP Power increases the amount of your damage that will break through the enemies Resilience. Given all players start off with 40% Resilience now naturally, PvP Power will give you the highest survivability in the short term as you should be able to outdamage another player.
In the long term you need both, one will reduce the amount of damage you take and the other will increase the amount of damage you do. Again, stat prioritization is greatly dependent on you and how you want to be able to dish out and receive damage in PvP.
Simply put, if you want to take less damage, get Resilience. If you want to do more damage, get PvP Power.