Building for max plunder isn't fun though.. You should be building for your own playing style. Starting out, guild hansel would be the highest plunder build, and it's also incredibly cheap. But once you enter the realms of T4, a T4 attack building creates the most plunder - in particular the Titan's Lair. But all T4 buildings are good, and each have it's own purpose - even towers! And of course, don't forget the SoSs. At the end of the day, the build is completely up to you. Just avoid mixing Cursed Foundries with Titans Lairs. Either stick with CoE and Titans, or CoE and CF. The combination of stats and plunder is much better than combining a Titans and CF.
You need a specific build when you do real wars You need a specific build when you plunder war You need a specific build when you do PvE There is no best build!
It was my understanding that when he asked for Highest Plunder he meant the build which makes the most plunder i.e gold, not Allies Bonus. My bad
What if your in a real war playing from pin? Defense means nothing. So why is balanced build best? I'd imaging something with higher attack for this case.