It depends on your style of play and how you plan on earning plunder. If you're doing pws the defensive builds are best with the 5% plunder in crease. Doing epic battles an attack build is better since it does more damage and thus gives a bigger pay out at the end. Attack builds are also great for plunder if hitting the BL since you can hit bigger targets for more plunder. Balance builds work best for plunder if you plan on doing complete unloads whenever you have time because they give the extra hits.