I think its important to look into the photography culture of each brand. Each company's system works great for general photography but there are some strengths and weaknesses to each brand.
For example, I shoot Pentax, and it is known for lightweight pancake primes. If you are a photographer looking for a light set of primes whether for landscapes and street photography, Pentax is the way to go. For me, this means it's easy to go hiking with lightweight primes. I don't really need the full 24-70 + 70-200 range. Also, with the primes it's easy to be discrete, so you can carry the camera with you every day, if you are into street photography. Coupled with body IS it increases te flexibility of each Lens.
Ofcourse, we do not have as good of an Af system as the other brands, and many lenses still use screw drive which can be loud. Additionally we don't have the regular set of fast cheap primes like Canon's 85 f1.8, and we don't have Nikon's CLS system.
Nikon and Canon are both good options, but they aren't the only options!