I voted that ignorance is worse. Ignorance may be bliss, but not for everyone around the ignorant person.
Plus, if you're ignorant but not apathetic, that means you'd take action against things you don't fully understand. Like lynching in the South--they killed people because of their race, but didn't understand that race is a socially constructed myth that forces people against their will into unfounded hierarchies of superior and inferior people regardless of one's true capacity to be a self-actualized human.
Suppose you're well-informed, but apathetic. You won't to anything to better society, but you probably won't proactively go out and hurt people either. I'm not saying it's not wrong to recognize injustice without taking action to stop it. That's really bad too. But less harm will be done. Less of everything will be done.
I guess being apathetic is worse IF you recognize when you're ignorant and so take action to become less ignorant. It's really best to be neither. Or maybe both.