It only seems like 3c G-Beams are better.
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With the time on target a Vulture allows, the pulse/burst lasers are better. Damage is less per second, but the number of seconds you can actively fire makes up for it. There is also some evidence that the pulse/burst laser is better if you're sniping PP/thruster sub-targets.
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I had 3C G Beams and power management on my Vulture was a little rough. I found that I ran out of juice pretty quick, and ended up dancing around waiting for the PD to catch up. With Pulse/Burst, it was a vast improvement. I could keep firing much longer, and doing more actual damage, than the beams.
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It ended up being a function of how much my PD could push per second. The Beams spent more of their time in recharge, and actual damage inflicted suffered. Pule/Burst, draining the PD at a slower rate, allowed more actual firing. It was more about Damage Per Minute vs Damage Per Second.
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Your mileage may vary, etc etc. But I've found beam lasers tend to work better on large ships, since their time on target tends to be limited and you need every micro-joule of damage you can muster in the small window you have. Then as you try to drag the target back into the main view screen for your next pass, you can re-charge them with your 6/7-A PD.
