I'm pretty sure this has been talked about before, but I couldn't find anything on this forums so I'll just go ahead and make this one.
 
My favourite theme is Dudley's. Such a awesome theme. 
 
 

Oh nice, I didn't recall Balrog having that theme. Sounds really awesome; though I didn't quite imagine that they would actually use that theme. Based on his appearance, I don't think it really fits with his fighting style and shit.
 
Of course, what am I to say with Dudley's theme? lol.

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Got to love the crazy awesome that is Hakan's theme 
 
  

" @Pessh said:

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I'm really digging Juris on the remixed or whatever it's called.

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I like Sakura's theme :) 
 
  

Balrog edges it but I do feel like getting on the dance floor when Dudley's theme comes on.

I hate him more than any other fighting game character but Balrog's theme is just flat out awesome. I gladly take the spammed crouching punches and random rising buffalos into ultra just to hear this song play. Heck, I'll put the controller down and dance while they whale on my stationary character.

I'd have to say "Gouken vs Ryu", which pops up when Gouken is player 2 with character themes on.

I wish they would bring back Charlies theme for guile .... it is my most favorite 
 
 

After listening to all of them I can now say that Makato's is the best.   
 

T.Hawks Hyper Theme remix.
  

i love vegas theme it just sounds way too awesome

The obvious choice is Sakura's Theme.
 

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Gen's is really badass.
 
I'll spare you all another link.

I like Juri's most. 

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I'd have to say "Gouken vs Ryu", which pops up when Gouken is player 2 with character themes on.

  

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A big tie between Sakura's, Akuma's, Balrog's, and Dudley's. 
 
Duds' theme is the sole song that makes me want to fucking dance. Akuma's and Sakura's are just very well composed, and Balorg's is pretty rad. 

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  *Cries for the loss of EEENDEEESTWUCTIBULL* "

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Cody's is the best by far.... 
 

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" Got to love the crazy awesome that is Hakan's theme 
 
  

  And by this point you should all know that he loves his daughter's, they are so pretty. "

" I like Sakura's theme :) 
 
  

   And for the added characters in Super, I like Cody's theme and Dudley's. :) "

Juri, Gen, Vega, Balrog. Cody's is pretty good too, and the theme of Gouki vs Ryu.

You are all small time.

After already playing hundreds of hours of Super Street Fighter IV, this has grown to be my favorite coz it's a combination of the themes of the most awesome game in the world! 
 
  

I miss indestructible.

" I miss indestructible. "