Drops for sure. Flared drops like a Cowbell even better. Incredibly natural hand position and the drops give me the most confident position for handling when cornering.

Flat bars are pretty uncomfortable and will have my hands going numb a few miles down the road, even when riding singletrack. I have found that with enough sweep and roll back on the bars, I can live with flat-ish bars. Basically once the bar looks like a more flared out version of the drops on Woodchippers then I'm good.