i only play AI

so you reckon repair+cluster rather than hangars? ok, what's a cluster, how many repair to turret?

oh and, btw, do we agree you have to go for manual placement coz auto is just not good enough?

3 turrent/1 bay against first 2 waves of pirates

1 turret /2 bay for support in case of enemy assault (no build is good standalone against human opponent)

if its an asteroid it just gets 3 turrets and a repair bay. if its in a really important position i'll build a starbase and 2 repair bays (and 1 turret to fill the last slot i guess). hardly ever waste money upgrading tac slots at a roid. 

if its a planet that i expect to see some combat at my first round of defenses is a frigate factory and 2 repair bays. i'll build defenders there to hold off enemies if it gets attacked. then, once funds become available, i upgrade the tac slots and add 2 or 3 hangar defenses loaded with fighters. thats almost always enough to secure a planet. big attacks need to be repelled by the main fleet or by a fully upgraded starbase, but smaller attacks will tend to bounce off. 

Eh, I generally put up 2 or 3 repair bays and spam turrets. I'm an offense player though, so that's just stalling until my fleet gets there. I put a bit more thought, with hangars and positioning of defense, and a starbase, around really important worlds. Sometimes I throw in a PJI for grins and giggles.

i normally play as Tec and against AI's (Cause im not updated in my sins lol i still only have 1.1)

but my normal tactical slots range from planet to planet i normally build 3 repair bays first of so any of my ships in there can repair while there fighting, thus giving more time for my main fleet to arive and deal with the pesky invaders.

then i build a hyperspace disruptor thingy (Phase jump charge up rate %700) so when my main fleeet dose arive and the enemy retreates then i can get a few more kills thx to the hyperspace interfearence

and ill mostly build hangers until i have no slots for them then the rest will be turrets

Definitely never use autoplace for defensive structures. To me, it looks like they are just placed randomly (which is obviously a bad sign).

Against the AI, I usually just build a repair and 3 turrets near the jump point into my well. There should only be 2 situations where an AI is attacking you, depending on where your fleet is. 1) Your fleet is in their territory (meaning their main fleet will be as well) so the attack is a pitiful bunch of seige frigs, with maybe some minor support. 2) Your fleet is in your territory (so it should be near where the AI will attack) and they invade with their main force.

The 2nd case should be a no-brainer. Your fleet should be able to enter and mop the floor with theirs. If they have a size advantage, build another repair bay or two to give you the edge. In the first case, I've always found that I can build the necessary defense before they do any real damage to my planet (usually just turret around the outside of the world to block off the seige frigs).

If you're playing multiple AI and you need to leave a choke point without a defensive fleet, always build a starbase and get at least one survivability upgrade before you send your fleet out and continue upgrading whenever possible.

The real benefit of static defense is that they don't take up fleet supply, which is, in my opinion, your most valuable resource.

even with a starbase in the gav well it will always depends on what planet i m in, usually

Planets:

turrets, hanger, shield generators, and repair bay

Asteroids

turret, hanger, shield generator

anything else, would have to be determined when I do build it