Sigh... Why does everyone always get so caught up on just the camera bodies. The lenses are a huge consideration when buying into a system, not just the body. Sure, the nikon body might have more resolution or more dynamic range, but what it doesn't have is that awesome canon glass.Yep, does Nikon have the 100-400L or 400mm f/5.6 as cheap options for if he gets into wildlife photography? Maybe he needs something like a G1X for travel, and a DSLR with a tele lens wildlife. Canon suits him quite nicely there, and better than Nikon's offerings. Whether the D3200 is better or not is irrelevant if his only option is the Nikon 300mm or $5000+ lenses.
If you're a teacher, you should be taking the broad view of things. Sure, I'd tell a landscape photographer to go Nikon, because their future is the D800 and the 14-24. For wildlife, Canon would easily be the winner for me. For someone with a video heavy focus, I might point them to Panasonic. For someone wanting to do a bit of everything, I still think Canon is a great option because they have great variety