If there were a definitive answer to the Canon vs. Nikon question, then everybody would be using one or the other.
Opinions are going to differ on which is better, but the bottom line for a beginner is that modern DSLR products from either brand are going to have potential that outstrips your ability to use it. Thats not an insult, its just reality.
So, in making the jump to DSLR, ignore the propaganda from the fanboys that argue for one or the other on the internet with such loyalty and ferocity that youd think the brand was their extended family and not a big corporation that just wants to take as much of their money as possible.
If you simply go with whatever product simultaneously feels right in your hands and fits within your budget, youll be off to the races regardless of whether its Nikon or Canon.
The only caveat Ill add is that when it comes to DSLR, the brand you choose up front has implications far into the future because expensive add-ons like lenses and flashes only work on one brand or the other. If, for example, you have family members who own gear from one brand or the other, you might factor that into your decision, because depending on how generous that person is, it might mean free access to additional gear. My dad and I work this way and its great.