oddly, I've found that missile turrets are more effective than lasers, seemingly due to unseen bonuses.
Also, I've recently discovered that 20 MLRS turrets are perfectly fine against most anything an ai will throw at you early game. Of course, add the same number of basic turrets, laser turrets, and missile turrets for improved usefulness. Voila, my cookie cutter wormhole defense turret setup.
Lately i havent even been bothering with tractor beam turrets