Science & Industry

Did you actually just intend to build stuff in it or mainly do research related things like blueprint copying?

Caldari.

Pos bottle neck is cpu. Caldari towers have the most of all the tower types. Since none of the towers give bonuses to manufacturing or research, Cpu is the thing to go on.

Also because Shields is what determines reinforcement and how long it takes to get there, the little bit more that caldari towers have means that it takes that much longer to reinforce or kill a tower.

Because you said you wanted to churn out bpc. you want a caldari tower for cpu. but make sure about fuel and its costs local and shipping it. it may be cheaper to use a local fuel source despite the smaller cpu on which ever other tower.

amarr towers are the worst though and its not worth using because of their much reduced cpu.

1. Caldari. Most CPU, but least grid, therefore defense consists primarily of massive amounts of shield resist and EWAR modules.

2. Minmatar. Good balance of CPU and grid. Second most shield too. Easily the most defensible (when people say "deathstar" they are probably thinking of Minmatar). AutoCannons require a lot of ammo, so use faction ammo only with artillery. I highly recommend Minmatar for towers in hostile areas.

3. Amarr. Most grid, least CPU. Extremely common in w-space, as there are no ammo hauling issues. With the addition of some projectiles to vary the damage types, Amarr towers can fit a formidable defense with a LOT of turrets.

4. Gallente. Better with one of the above, especially with isotope interdictions. Poor defense (hybrids are horrible, so use projectiles). Gallente do excel at being used for reactions, but Amarr are nearly as good for that.

Pretend that missiles and hybrids do not exist when making a defense plan, as both these weapon systems are horrible (unlike their ship-based cousins, POS weapons are not balanced). Un-bonused projectile turrets are far superior. Bonused lasers are of course the primary turret choice for Amarr towers.

My first tower was a Medium Dread Guristas (Caldari faction). I replaced it about a month later (ugh) when I realized how lacking it was. I upgraded to a large Domination (Minmatar faction), but sold it when the market prices hit 2.2b; it was too much of a risk having that much ISK in space. I now have three standard large Caldari towers. I don't recommend using pirate faction towers anymore.

TIP: For more threads on POS related stuff, do an advanced search with POS related keywords, and look for posts by me. I post a lot on the topic.

I've used both Caldari and Minmatar for numerous things. My goto flavor though is always Minmatar, the gain in offense/defense capability vs the loss in cpu when compared to the Caldari just makes it the best choice imho. It also has the best racial resists along with the best offensive bonuses, and it can naturally deal omni dmg when properly loaded out.