5 More megapixels always means a better camera

What’s the difference between 12 megapixel cameras and 8 megapixel cameras? Not much, as it turns out. The quality of an image is determined in large part by how much light the sensor is able to take in. Bigger sensors may come with larger pixels, and the larger the pixel the more light it can absorb. So, it’s really the size of the pixels that matter as much or more than the sheer number of pixels. (A megapixel is simply shorthand for a million pixels.)
Here’s how TechCrunch’s Matthew Panzarino, who's also a professional photographer, describes the role of the pixel: “Think of this as holding a thimble in a rain storm to try to catch water. The bigger your thimble, the easier it is to catch more drops in a shorter amount of time." The thimble is a metaphor for a pixel — using a few buckets would be much more efficient than a bunch of thimbles for catching water.