see whether you find a Nikon or Canon the more intuitive to switch on, pick a mode and take a picture. Technical differences between them, and the alternate 'functions' they offer are splitting hairs for the most part, you'll get far more from just getting one you find easiest to use, and going and using.
This, 100%.
Don't get suckered into comparing specifications. Most DSLRs have way more functionality than most people need. And if you find that you're hitting a limitation on your DSLR - if you need better AF performance, say, or better low light capability, or a faster frame rate - then you can get that by upgrading within the same range. There's a healthy second hand market in DSLRs and upgrading is easy.
But the one thing you can't "fix" by upgrading is how well you get on with the controls and the menu layout. Those things are baked into the manufacturers' DNA and don't change from one model to another.
For example I handle Canon and Nikon DSLRs every day, and I find that:
- one of them has the control dials in exactly the right places, and one has them in places where my hands don't find it natural to use them;
- one has lenses that rotate in what seems to be the intuitive direction for focus and zoom, and one rotates in the opposite - "wrong" direction;
- one has a menu structure which I find completely intuitive and logical, and one doesn't.
Fortunately in each case it's the same one which feels "right", so that makes it very easy for me to decide which brand to use. But I know people who disagree on every point here, and are very comfortable using the "other" system.
I wouldn't want to buy into a system where, every time I zoomed the lens, it felt like I was zooming it the wrong way. I wouldn't want to buy into a system where I had to stretch and bend my fingers unnaturally to use the controls. So that's why handling them is more important than comparing the specs.