Not to turn this into any battle or something, I said both are really really good but Nikon isn’t the superior brand. Sorry for that but there sensors in the same price range make noticeably worse pictures, IQ is down by a tiny bit, noise is up by a bit more and worse of all, they use more aggressive noise reduction (even with NR turned off, to trick the non-pro into thinking it’s better). That said, Canon’s need fewer color corrections when calibrated, Nikon’s colors are funky but unreal.
Not to start a war here or anything but I’ve used both for a long time professionally and recently review models for a local store and those are the facts.
Still for this question, since the user is looking for a rebel-series camera, I say brand isn’t that important cause he won’t be pixel-peeping, calibrating and printing large format.