Which Digital single-lens reflex camera better?

I want to buy dslr camera, i prefer good quality image.nikon 3100 n canon 550d, which 1 is better?

Canon is alwaysalwaysalways better.
I've used a Nikon at school and I own a canon and I love canon way more.
<3

Between these two, the Canon would be better in terms of specs. However, you're comparing apples to oranges. The Nikon D3100 would be more comparable to something like the Canon T3 and T1i, while the Canon 550D is more like the Nikon D5100.

Doesn't matter much. Since you're asking means you have 0 photography skills. You'll take just as bad pics with either.