Are there advantages to not killing Big Daddies in BioShock?

Question

I just now picked up BioShock. I have yet to face a Big Daddy, but have been introduced to them via an in game cut scene. Before I engage in mortal combat with one I had a question about the necessity to engage them. I think I remember reading / hearing that you could complete BioShock without killing any Big Daddies or Little Sisters. It's also entirely possible that you can't and my memory is foggy.

Can you complete the game without killing any Big Daddies? If you can are their benefits to doing so? Are there disadvantages for not killing them?

I ask because unfortunately, I generally don't have time to replay games so look to complete them with the best outcome possible. I am very early on in the game so please answer with as few spoilers as possible.

Asked by ahsteele

Answer

Other than maybe saving ammo and so on, there is no advantage to not killing them.

There is an advantage to killing them:

You can rescue or harvest the Little Sisters they guard after killing them, which lets you get more powerups.

Not all BDs guard Little Sisters. You do need to kill at least 3:

Two in Haphaestus in order to complete the EMP bomb, and one when you're escorting a Little Sister.

Answered by Matthew Read

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