But which one should I choose? This is for a PvE Trapper (Hey, its fun!

[card]Trapper's Focus[/card]
+ Its a preparation, Stances can be used.
- 2 second casting time, not good when under fire.
+ It lasts a good 17 seconds at 12 expertise. What every trapper should have.
- Only lets your traps not easily interruptible. Plus interrupt skills still have effect.
[card]Tranquil Was Tanasen[/card]
+ Makes everything un-interruptible and Add's armor.
- Its a item spell, staffs will be kind of useless for energy.
+ 1 second casting time, preparations and stances can still be used.
- Needs high Restoration Magic to be effective. Taking away from other attributes.
I need to know, what would be best for PvE and AB