@Ninoyiya  
What would win: 7 Chaos Emeralds, 6 Infinity Stones, 6 Elements of Harmony, or 7 Dragon Balls?

Sonic wins. Peroid. Not only does Sonic have Super Speed but he has also learned how to use Shadow’s Chaos Control to warp time and space. You can’t go any faster than when you’re warping Time and Space itself.
 
Since Rainbow Dash can’t warp Time and Space Sonic wins. Hell, with Chaos Control Sonic will reach the finish line before Dash even gets 3/100th of the way there.

@Komyo  
>Rainbow Dash’s top speed without the rainboom was calculated by fans and is supposed to be at 3800 MPH (mach 5), and she becomes even faster when she uses the Sonic rainboom. Her speed then seems to be at 7600MPH (mach 10).
 
This is incorrect and has been debunked by someone who did much more accurate calculations. Dash’s top speed with Sonic Rainboom is Mach 1.2 to Mach 2 (if we’re giving her the benefit of the doubt).
 
Sonic’s speeds range from Mach 5 and up to potentially beyond Mach 10 if he’s pushing himself. These numbers do actually exist by looking at the speed numerics for Sonic Unleashed, as well as both the Sonic Adventure and Sonic Battle manuals remarking on these hypersonic speeds as well.

The biggest problem in finding out who would win depends on some facts.  
Who is more agile or accelerates faster? Will it be rainy? Windy? Both or normal weather?
 
But the most important problem are their top speeds.
 
Rainbow Dash’s top speed without the rainboom was calculated by fans and is supposed to be at 3800 MPH (mach 5), and she becomes even faster when she uses the Sonic rainboom. Her speed then seems to be at 7600MPH (mach 10).
 
No matter if true or not, these are numbers to work with. But what about sonic?
 
We have probably never seen the top speed.  
Why i am so sure about this? Let’s use the “Sonic X” version since both are from a modern show then.
 
In the very first episode it can be easily seen that he accelerates to Mach 1 with ease, and his stamina was not even close to being drained. In another episode he was forced to run for over one and a half day.  
According to “Death Battle” (A show on screwattack) his average speed is 765 MPH (mach 1), which he reaches in a matter of seconds.  
What this means? This means he has a incredible amount of stamina. So it is very possible that he can use it up faster, thus, running even faster.
 
And this is where the problem is. He shows signs that he is able to go faster, but since there was never a record of his true high speed it is pointless to think who would win in the first place.
 
The best thing we can do is simple:  
Once Sonic’s true high speed is known it will be a different story, but until then just ignore it.
 
 
Anything offensive that is directly against me will be ignored.

P.S that last comment was from me ‘Batterypoweredmonkey’..  
Kinda would’ve like to be asked for it to be put here..

Woah.. My vector.. How did it get on here? i’ve never been on here before D:

Facts:  
Sonic Rainboom = Mach 5  
Sonic’s top speed without going super = Mach 10

sonic can move at the speed of light in some comic`s and in the games [lightspeed dash] so … he wins ^_

I like it!

To be fair, I have heard some other calcs that sonic can also go mach 10, granted it’s comic sonic who is different (read, faster) from the tv and game sonic.

^ Super Rainbow Dash?

 
_{{font-size:12pt}Plus  
 
{font-size:12pt}What would happen?}

 
Get a room you two.  
Going back to the pic, I’m surprised this it managed to get a positive rating.

Besides that, obviously.

^  
I hope they like to see a bunch of image URLs then.

I was about to, but then I remembered the “comments this user has made” link in your profile and realized everybody can see for themselves.

I’d much rather insult you instead, Blackie.
 
Suika’s jerkish antics aren’t as numerable nor are the as memorable as yours.
 
In fact, apart from this, I only remember one other instance of Suika being a jerk and I don’t even remember what he specifically did.
 
You on the other hand give me enough stupid/douchey material to write a whole page.
 
Most notably this.

Just shut up you both and start insulting eachother.

lol shitstorm where…oh wait there is none

>HURR DURR A SHISTSTORM’S CUMMIN’
 
No it really isn’t.

Oh boy the shitstorm is about to begin!