The defensive building grants a 5% bonus to plunder (or was it another number I apologize if wrong). But it does grant a bonus to plunder The Coe (circle of elements) grants 2 extra attacks (but only once. So having more then one isn't really necessary) (wheras I believe the defense bonous stacks). The attack building obviously makes you able to hit higher up. But that's only helping you make more plunder if you're failing without pots.
Hybrid is entertaining, to be useful in war you need a stack of BFA. Hansel is fun to harass people and have them not know its you, and attack is great for well is just the standard build
Turtle builds are fun if you have bfa and equipment, cuz then you can use bully mechanics to your advantage and smack people up, then when they try to get revenge they fail every hit endlessly