Nikon or Cannon is better ?
Pick the one you like. You wont go wrong with any of them. It is that way.
Both these companies have come a long way and are equally good.
some insights:
1. You are not choosing just a camera body but buying into a "system" which you will build over time (lenses, etc) So take a long term perspective
2. Many pros have been using the Canon's. Have you noticed those "white" colored lenses?

Those are Canon's. Many people feel owning one of those white lenses enough drool quotient in itself.
Instead of going with one-to-one comparisons on specs on paper it is wise to choose something that fits your hand like a glove. Just go to some showroom and try out the cameras you are considering. Pick any one that you feel comfortable with. Ergonomics pays off in long run and jazzy features take a back seat and are often forgotten.
Some features are indeed useful like DOF(Dept of field) preview in which you can preview the DOF before you take the actual shot. Save you some couple of click and then preview cycles. Or the bracketing feature that helps you take multiple (example 3) shots with different exposures [underexposed, correct exposure, overexposed] you can choose a shot which you like. or these shots can be superimposed to create HDR images.
But pretty much any respectable DSLR in the market should have these features.
Also as a side note: If you had a budget it would make sense to invest in a decent DSLR body and invest more in some good lenses. Rather than invest more on body and get cheaper lenses.
Afterall what the camera sensor sees is what passes through the "glass" (lens).
It would be very difficult to make out the difference between a photo shot with a Nikon or a Canon. But you can easily make out the difference between a shot taken with a normal kit lens and a good lens.
(Side note: If you are just starting out *then* spend some time with the camera and then explore what kind of photos you take - landscape, portraits, bird, architecture, etc and then choose lens most suitable for that type of photography)
Just my 2 cents.
Njoy clicking!