PACERS: I'd assume that not too much explanation is needed here. Holiday is old and doesnt fit their timeline, and they could use shooting. Adding Harris helps. Their D takes a hit, but they add young assets so its definitely worth it.
NETS: For the Nets, they need D. Holiday and Turner change that up, and having KD, Harden and Irving who can lead their offense with Turner, Holiday, KD and Bruce Brown for their D could be near-average. This gets them the defense their lacking, they lose a LOT of their future so they'll have a tough rebuild but its worth it because they'll win a championship.
Chance the Pacers do it: 90 pct
Chances the Nets do it: 80 pct