Phase turrets have got it for shields, since they do the most damage (37.5/second), are accurate, fast, and have long range.
Emalgha do the most damage to armor (31.25/second), but the range is so short that you guarantee that you are taking fire from your target.
Blaze is a nice compromise (30/sec to shields, 25 to armor) but the range is shorter, and the accuracy is marginal.
Neutrons have okay damage but are no better than the cannon version (as mentioned earlier), and end up being very anti-accurate, because the slow shot speed messes up the turret's aim (as mentioned in the weapon problems thread).
Unless you are spending most of your time in Voinian space, phase turrets should be much better.
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Eagles may soar, but weasels don't get sucked into jet engines.
(This message has been edited by pagangod (edited 12-08-2000).)