Javelins are much easier to aim at the hostile target. Once you fire off a small burst, you know when and where to adjust the angle of your ship, so you can score some direct hits on the enemy target. With heavy rockets, you can only fire one about every 2 to 4 seconds, (depending on how many launchers you have) and you don't get the same advantage as you do with javelins.
In the current plugin the Corsairs and I are developing, we have made an outfit that operates very much like the javelin rocket. It's called the "Gun Pod," fires faster, has longer range, but not quite as much punch. The ammo is only 100 credits for each rocket, making them excellent for smaller fighters that don't have the the cargo space to make much money.
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~Captain Skyblade
President of the Corsair Development Team
(url="http://"http://artworks.tmgmedia.net")Corsair Homepage(/url) | (url="http://"http://pub57.ezboard.com/bcorsairdevelopers")Corsair Web Board(/url)