First of, I'm a blade dancer/assassin but I wasn't sure what I should use as a 3rd soul. I'm torn between riftstalker for 12% AP (or 15% if i decide to not take a 31 pter for some reason) or 10/12% armor pen from the infiltrator soul. I know my build does mostly physical and bleed damage, but I didn't know if the armor amount by everything else made using armor pen worth it.

I do plan to use this build for both pvp and pve.