Nightcrawler's teleporting can match Quicksilver's speed for short bursts, but he'd wear himself out quickly. Quicksilver's not just faster, he's also a lot stronger and has more stamina, so I'd have to give it to Pietro.
Actually, Nightcrawler is physically stronger than Quicksilver, but Quicksilver can hit harder because his speed adds momentum to his punches. Kurt could easily win this, port onto the wall/ceiling, move when Quicksilver tries to get him, then port a punch into his head.
His legs are stated as being similar to spring steel, nothing about his upper body, which he doesn't really use in his speed. To put it simply, Kurt wins in a fist fight, but if kicks come into play, he does down. And Kurt can always cling to the wall, and hit Pietro when he comes for him.
And as soon as the fight starts, Kurt can just port around QS in a circle, reigning down blows on his silvery head.
Quicksilver can just see him coming he doesnt just run fast he thinks fast two by the time NC teleports anywere and pietro wants to take him down its over
Euh you do know he doesn't only run fast but also has a much faster reaction than nightcrawler, or do you think quicksilver will just stand there and do nothing.
He would start the fighter sooner because of his reaction time.
And will dodge more because of that.