Heat sink question.

Recently purchased the game and a new joystick, as I’ve been a huge fan of the whole space based trading/ piracy genre for years (since Privateer II the Darkening if you must know, Im a youngster still and Elite was before my time)…. just have a simple question. Which heat sinks are better? Which is the top of the scale and which the bottom in regards to alpha/beta/gamma etc…. I have gamma to start, so assume they are the worst performing, but can’t find confirmation in the manual or encyclopeadia. Any help would be appreciated.
Quality game by the way…. I picked up my two turret fighters, and have finally started getting some respectable piracy going in preparation with business with the marauders…. whoever they are… don’t spoil it for me though.

Our last hope went out with Captain Mission.