Well we have the one in AoU who acts pretty much like him in the comics and then in DoFP we have a guy named Peter who acts behaves way more like Kid Flash. So there can only be on answer Aaron Taylor-Johnson, because he was the only real Quicksilver we got. Whos the more fun speedster is a totally different question. Here I' say Evan was more fun with the cooler sceen but he was only that way since he was so overpowered and barely used. Aaron was very funny too, but he was really there to be a plot device for Wanda in a reversal of the girl in a fridge trope.