I'm looking to use this mainly for product photography, and have one main question. Both of these cameras are available with 18-1x5 lenses with f3.5-5.6 max apertures as a kit. Are these lenses worth it? Or would I be throwing money away on one of those? At the moment, I'm leaning towards the Canon, but need to play with the two side by side to make a decision on brand. Thanks!
The discount on the kit lens included with the camera are considerable. Given that your target is non-moving, and in controlled light conditions (product photography): I cannot imagine what you'd get from a better lens.
That said, and not knowing what product: You'd likely be looking at something like a prime macro lens if not the kit lens? At least on the canon side: there are some *very* good prime macros <$400 used.
So let's examine what goes wrong with "lesser lenses".
To slow an F-stop? Not a problem (you control the lighting and can shoot from a tripod (presumably))
Barrel distortion / pincushion? Usually only a problem at certain zooms... pick a different one. Often correctable in post.
vignetting? Usually only a problem at the fastest F-stops.
Slow focus? Again: controlled light, tripod, stationary object. Non-issue.
So really: the biggest argument *I* see against a kit lens for product photography is if you need macro capability.
Camera body difference?
Megapixels? Don't matter. (are you doing pictures that will be zoomed to poster size?)
Anti-aliasing filter? See above.
Focus speed, whether it has phase sensors in the main sensor, etc? Doesn't matter. Stationary target.
Performance at high ISO? Irrelevant (again: controlled lighting, stationary target)
Dual card slots? Can't imagine you filling one... esp if you are using the wireless to transfer.
What will matter?
Dynamic range? That might be important (Nikon wins there)
Controls (like the ability to sit with your iPad and preview / change focus / change settings while not behind the camera)? You might care about that (Canon wins there)
Rotatable screen? You might care about that if you aren't using the iPad above. You might not. (Canon wins if you do).
So in your shoes: I'd pick which ergonomic set I care about. If I didn't care about the whole Canon control system: I'd take the Nikon for its improved range.
Or: I'd find the lens I want and buy the body that goes with it.