Engine Boost or Broadside with 3 Laser Upgrades.
However, how can you initiate a fight if you can't even catch up to your opponent?
Engine Boost provides roughly 70 engine power for 10 seconds with a 40 second cool down. We could therefore say engine boost is roughly a 17.5 move speed contributor in terms of movement. This is well over 100 gw/s of power into engines at the cost of, what, 3000 every 40 seconds (75 gw/s)? And most importantly, this boost is all in the first ten seconds, removing you from combat instantly upon use if the opposing team does not have it.
Not only is it more energy efficient, it's easy to access and difficult to catch up to unless you're willing to take a large hit on energy yourself. You may say that this is simply a perk of the ability, but let me give you a list of what it contributes once more for the sake of argument.
- A method of boosting engines on the Navigation Console rather than the Engine Console. This means that it is extremely simple to macro over rather than going back and forth across the ship to alter energy management.
- A more energy efficient method of movement. Somehow, you would expect an ability like this to be much less energy efficient than actual movement, but it ends up being far superior.
- A method of quickly escaping most combat situations if the opposing team lacks the upgrade.
In short? It's currently a 100gw/s per second upgrade on engines (before stabilizers) if you're constantly using it with the benefits of powerful combat getaway, juking capabilities for the inexperienced, and easy of use due to mingling with speed and direction. Getting 50gw/s bonus regen on your BC alone costs 250y 75b and 25 kerm. Compared to a 200y 50b 200r, the difference is quite large and you're already getting several other benefits. That's also ignoring the research time by comparison.
Plus, you can't initiate combat unless you actually catch up to your target. Come on.