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I'm contemplating which one of these I should research.
If I recall correcly, the Planetary Fortress is an upgrade to the Command Center (unless it changed since the beta), but what is the turret thing?

Anyone have any thoughts on which is the best and why?

I can't tell you what to do, but bare in mind that planetary fortress is mainly to defend an remotely excavation site (expansion :), at least in the Beta, you really need to decide if you need that extra defence :)

Information on the flame turret would be awesome, thanks.

Its awesome against zerg rushes etc... burns 'em to hell and with a large range it burns them while they wait to get space. Best placed at choke points.

The pplanetary thingy is just extra defence. If you play good i dont think you need the extra defence. I reckon its a waste.

Thanks for the info :)

Get the turret, it helps a lot in final mission

Get the perdition turret. It deals huge damage to groups of enemies so one on either side of a choke will hold off like infinite zerglings. The planetary fortress is kinda pointless as I don't think there are really any missions where it would be super useful.

The planetary fortress is only useful if you intend on using a command centre as a weapon in smaller bases intended solely to harvest. In the campaign you never really tend to have enemies anywhere near your mineral line, and even if you did a perdition turret is even more effective anyway. Plus, you can build as many of them as you want, salvage them and they're great additions to a bunker/seige tank line.

Definitely the flame turret, since you can also do offensive turrets.

The fortress is purely defensive, if your command center needs it, you need more army.

Depends on your playing style. If you are playing offensively i do think you should choose the flame turrets :) !

Of course PERDITION TURRET.
Because you should have comsat stations to drop mules in every CC.

i got the turret

I got the Plannetary fortress, and the only place where I've used it so far is in the mining laser mission, and there it didn't do super much. While I don't see a huge need for mules for harvesting in the campaign, I still reccon they are the better option, I wouldn't mind having some flameturrets now :( owell I still got firebats :D

In retrospect I should have gotten the planetary fortress. The missions where you're endlessly defending that fortress is endlessly better than the flame turret. For anything else a bunker with marines is enough.

Its gotta really be the planetery fortress for me cause u can make a flame thingy by just sticking some firebats in a bunker, and once you get the bunker upgrades they work a lot better than the turret.

Neosteel Hardened Bunker with range bonus and 2 firebats and 2 marines inside.

They both are good on different missions.So far I haven`t seen any practical use of the PF but I have used the turret and let me tell you it is a lifesaver on the zerg missions.