This is a tough decision, but it really boils down to whether you're looking into the past or future. Knowing everything that no one knows can advance technology and lead to a higher quality of life for humans in future generations. On the other hand, knowing everything every human has ever discovered, but not passed down, could give us a better understanding of how our planet and it's inhabitants shaped itself over time. I like Science more than History though, so I'll probably go with the first option.
Be more consistent in aim or accuracy? (Yeah, this has probably been asked a lot, but I'd go with aim since I don't really care much for accuracy)