If I'm rebuilding and want the guy with the higher upside, I'd go with Kirk. But I agree that even then, you should be able to maybe get something small added to Kirk. If my goal is to compete though, it's definitely Woods by a lot.
I don't know if you can get a 1st for him right now, but I'd probably sell for an early 2nd if I was deep at RB. You might be better off waiting until he signs or when the season starts to sell though.