Dane

I think Franco was better overall, across all 3 films.

DeHaan just didn't feel right, until halfway through his sole appearance.

James franco

Franco for me.. but I agree with @Ostermans assessment mostly.

Franco may have been cheesy, but I believed him more as Goblin and a friend of Peter's than Dehan.

Although Dehan did play a good Harry (Before he found out he was getting sicker).

I like James Franco’s Harry Osborn

Franco obviously

DeHaan wasn’t that bad at Harry or Goblin to be honest, I enjoyed his development into the villain, but I feel like he wasn’t completely necessary to the plot of tasm2, except for the ending and breaking Electro out. Franco’s Harry and Goblin both had much more to them.

Ofc James Franco

Franco was the better green-goblin.

Dane was the better Harry.

Like it was already said, seeing Dane as Harry didn't feel right. James was just so awesome for Harry