Corsairs or Eldar?

I was wondeirng what allies I should use for my DE. Corsair or Eldar.

I thought Corsairs would be cool because of the prince. However as I kittet him out he started to cost as much as a farseer. Also, that farseer has jetbikes. The prince does not get his exstra move when he is in a mixed unit group (and he needs relentles for his ordenance missile.)

What the corsairs then offer is one mandatory unit of super guardians. And the flyer. But with Imperial Armour books the flyer can be taken with regular eldars as well.

Are the corsair troop choises really that interesting compared to the scooring bikes that the eldar have? Is the farseer better then the corsair prince?

The reason why I am asking is because while I would looooove myself some pirate allies there is little reason to take them. Whatelse, the eldars will get more content later on in the form of a new armybook suposebly.