I mix everything up for my defense, and it works against most threats.
On planets I really am defense heavy on I have something like this:
- A glob of ~50 Spider Turrets
- A glob of ~50+ Sniper Turrets
- 2+ groups of 5 tractor turrets / enemy wormhole in system
- 1 grav gen/enemy wormhole in system (1 covering multiple wormholes if they are close enough together)
- Varied size groups of Basic, Laser, MLRS, Missile, and HBC placements within proximity to enemy held wormholes - more group placements further in system for systems with more than 2 enemy wormholes.
Later game I backup the defenses with Fortresses and/or small fleets of lower MK vessels.
I have been able to hold out against most of the things the AI throws at me, though that little issue when the AI ship cap was lowered creamed me (I could take a 2,000 ship wave.. but not one containing mainly Core and MK IV ships :/). The only AI thing that completely blows through my defenses are those damned Marauder Dagger Frigates (yes, I am harping on them again
)