I'm gonna get flamed but I would much rather have Draymond Green then Rodman.
Rodman was no doubt an elite rebounder and paint protected, but Green can guard all positions and can pretty much do it all.
Green is pretty much the Bull's Rodman, he brings toughness, defence, rebounding and hustle.
Though Rodman would probably win a fist fight amongst the two.
They both were used differently.
The Warriors need Green to guard all five because of today's "smaller" NBA with very little action coming from the center position.
Rodman didn't really need to guard centers because he was an enforcer who was used to guard other teams' best power forwards during an era when the PF position was deep.
But if need be, the Bulls could send Rodman to guard bigs or stick point guards or small forwards - he even guarded Shaq at times and he guarded Magic during the 88 Finals as well as Drexler and Kersey in the 90 Finals. In '96 he stuck one of the best PF's in the leauge Shawn Kemp and completely nullified him while switching on Gary Payton whenever Glove and Kemp ran PNR.
The advantage Rodman had was that he had a nose for the ball and was one of, if not, the best offensive rebounder the game has ever seen next to Moses Malone. Extra possessions for the Bulls were a given with Worm in the game.