User blog comment:Avizyko/Comparison: Pit/Dark Pit/@comment-25161957-20141014072840/@comment-24776964-20141014134411

Using the grass pattern, I measured their melee knockbacks against a 200% Zelda on FD Green Hill Zone. They were the same... Their uncharged neutral specials are the same too. However, testing their charged neutral specials revealed that Dark Pit's arrows have significantly more knockback than Pit's. That additional 2% packs a punch... Pit's arrow knocked her off the stage, but Dark Pit's arrow sent her flying. (Not enough to KO from her spawn point, though!)

I tested their Side Specials against a 100% Zelda... Pit's launched her nearly directly upward, while Dark Pit's launched her diagonally upward... They both required  Zelda's damage to be raised to at least 130% before they were able to KO her from her spawn position. Their effectiveness depends on positioning, as Pit could KO Zelda from center stage while Dark Pit couldn't, due to the angle.

Using the clouds in Dream Land, I tested this as well. At the start, both of their normal jumps can reach the bottom of the highest clouds... And when using only their Up Special, they tapped the top of the stage. I would say they have the same recovery...

I'm starting to see the differences between the two, now... I believe I prefer Pit at this time.