which one is right?
Perfect Style (Ex)
At 20th level, a master of many styles can have the stances of five style feats active at once, and can change those stances as a free action.
This ability replaces perfect self.
OR
Benefit(s): When you take this feat, choose one of the following houses of combat styles; once this decision has been made it cannot be changed. While using this style, you gain a type of energy resistance based on the house you have chosen.
Students of iron gain acid resistance 5.
Students of flame gain fire resistance 5.
Students of wind gain electricity resistance 5.
If you have energy resistance from a racial trait or class feature, the energy resistance gained from this style stacks. Additionally, you gain a ki pool that you can use to activate abilities of your chosen House of Perfection style. Your pool contains 1 ki point at 1st level and increases by 1 point every 4 levels thereafter. If you have a ki pool from another source, you do not gain additional ki points from this feat.
Special: You may select Perfect Style multiple times. Each time you do so, you must select a different house to belong to.