Canon T3 or Nikon D3100? - 2

What one is better for entry-level, but needs to take wonderful pictures.

Actually that word "better" doesn't apply… When it comes to these two companies there's no "better".
There's different yes, but not better.

I only recommend what I own and therefore know - Canon.

Wonderful pictures? Please define that. If the photographer doesn't know what to do with a camera, no camera will make wonderful pictures.

Considering these are the cheapest models, there aren't even any differences that would be big.

You're expecting nice shots but if your subject is bad, if your scene looks boring and the composition is bad, nothing can make it look good. None is better, all DSLRs are the same especially since they both are entry-level.

Here's a DSLR Buying Guide - http://www.the-dslr-photographer.com/2009/11/which-dslr-to-buy/

Choose the canon