Lets make this easier, Mario fans or Sonic fans? What's easier to deal with.
You know that's not a fair fight. Any sane fan of gaming knows how awful a lot of the sonic fandom is (unfortunately, I consider myself a part of that fandom...).
You have fans of every type for mario and few crazy ones. Then you have sonic fans, oh boy...
There are many types of Sonic fans:
The casuals: A causal fan who likes the series as a whole.
The hardcore fans: These fans are in love with the series despite it flaws and can range from healthy fandom to absolute obsession.
The regular RPers: These fans are likely interested in RPing as a whole or the sonic universe. They think it may be cool to create a character and screw around in that universe, typically not stepping over bounds.
The comic fans: I don't know why these guys like the comics, but they like the comics. They are sane like any other normal comic fan or nerd.
The normal furries: These guys take their love to sonic to the next level, but are still understanding of others and know social norms.
The Fanboys: These fans are past the point of obsession. They live, breathe, and drink all that is sonic. Sonic has become their god and his pals have become his pillars of glory.
The classic gamers: These guys only enjoy the old 2D games. Sonic for them died after S3&K (in some cases, sonic 2 or Sonic CD). No matter how good a new Sonic game can be, it will never be good to them, they are blinded by their hatred of all things 3D. Their main issues are that sonic isn't fat anymore, has green eyes, has longer spines, and isn't in 2D.
The Mobians: These fans take the Sonic comics as the gospel of sonic. Everything in the comics is canon and infinitely superior to the games in every way. Their gods include (but are not limited to) Edgy Super Sonic, a variety of Captain Planet Super Sonics, Arnie tails, Greenie the Enchilada, and Devil Sonic.
The Neo gamers: These fans prefer the 3D games over the 2D, most notably Sonic 06 and Shadow the Hedgehog. They flock to new sonic games like fleas to a cat and will defend it no matter what. This is typically just a stage before they turn regular or to the dark side.
The recolors: Every fandom has them.
The crazy RPers: This is where fanboyism meshes with art and other dangerous elements. Sometimes the RPers will pretend to be sonic&pals, but the majority use their skills to create awful "Original characters". They pretend to be sonic's brother/sister, Sonic's lover, Sonic's son/daughter, evil sonic, super sonic, super sayian sonic, goku sonic, (insert anime character here) sonic, the new god of the sonicverse, a demon of the sonicverse, anything related to Edgy the Hedgehog Emo the Hedgehog Shadow the Hedgehog, Tails/Knuckles/Amy/etc's brother/sister/lover/etc, or TinyArms McGee.
The "normal" furries: These guys have lost most of their understanding of social norms. They can still at times be reasoned with, but typically not.
The hardcore furries: These guys are pretty creepy and make quite a bit of nasty stuff.
The batcrap insane furries: Do I really need to explain?
- ??? or the hell of the fandom
The Dark Ones: Please, I beg of you, don't try to find them. If your mind isn't strong you will be torn apart by the darkest creations of mankind. They are really this bad. The category will not include subcategories, even these depths would make Cthulhu shed a tear. Sonic is dead to me, just remembering what I've seen...
