Not comparing Swain to Fizz at all. Was saying that a decent Fizz player should easily counter Swain in mid since Swain should never catch Fizz in his trap. Sorry to say, but if Fizz loses mid to Swain then someone is doing something horribly wrong because even after Swain gets his ult you should still be able to at least keep him neutralized.
Obviously Swain brings more to the team because his ult damages all nearby enemy champs where Fizz's ult only hits those in a pretty close group. I've found that in most teamfights though I can usually hit at least 3 people with Fizz's ult and jump. Not too bad IMO since it does a ton more damage right away than Swain does, but he doesn't have the sustained damage to the enemy team like Swain does.