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Don't get too caught up in MP counts. Photo sensors are one instance in which higher pixel density is not favorable.

In other words, for optimal light sensitivity and shooting in all lighting conditions and optimal image quality, the larger the sensor, the better the data (image).

Not coincidentally, this is why full frame DSLRs (35mm sensors the same size as a 35mm frame of film) with no crop factor cost significantly more than their cropped sensor counterparts.

That said, those who actually need full frame sensor DSLRs are a small niche market (typically pros or serious hobbyists who have thousands of dollars worth of lenses).

As for going with a DSLR, the primary reasons would include greater control over exposure, aperture and shutter speed (not neccessary if one always shoots in Program mode), and just as importantly, access to a wide array of different lenses to accommodate just about any shooting scenario and composition. If you're only going to use the kit lens that comes with the camera, you're not really making full use of the DSLR's functionality.

Lenses get expensive fast, not that some of the most useful and commonly used lenses aren't reasonably priced if you know what you're looking for.

So to recap: DSLR if mostly shot in program mode with one lens (kit lens that came with the camera) > not the best choice IMO. They're bulky, heavy and unless used properly, generally won't yield better pictures than a good quality point and shoot.

Add some fundamental knowledge of DSLR usage, lens selection, and suddenly the merits of the format become clear.

Consider looking into mirror less systems too. They offer lens interchangeability, high quality images, but without being hindered by a mechanical mirror system, making them much smaller and lighter with much faster full resolution shot capabilities.