I like a weapons that are cool and gives awesome looking attacks and sounds

Cannons,MIRV Missile turret,Triple Barrel Energy Cannons,Triple Barrel Cannons,M.A.C,etc

or just have a planetary to space defense Cannon,Energy Cannon,Beam Cannon buildable that helps with defense of your planet or have a Planetary Fortress (got that name from Aurora 4x) that gives about 2x field armies (which the total amount of that is 160000 troops and also got that from wikipedia) and also give the defense force more health