Batum easily, he is younger and so versatile he is probably a 1 round pick in any fantasy league. However, if TrailBlazers continue to improve their roster his play will advance into winning them games for sure.
He improved vastly last year and many doubt him for his statpadding, but he is a great defender in my opinion, it was just his team that couldn't win last year because of their bench.
If he'll be injury free, he'll be twice the player Deng will be.
I would take Deng if I wanted to win today, Batum if I wanted to build and win in a year or two.
Deng is a much better player right now, especially in terms of bball IQ and awareness, but Batum is on an entire different tier in terms of athleticism and is still only starting to scratch the surface of his potential. I would also be worried about Dengs health down the road considering he almost always ranks #1 in the NBA in minutes played, thats a lot of milage.