Whenever possible, do not rely on the specs to select your camera. Actually go out and try the camera in your own hands. If not, forget the specs. You won't use it, and your investment will be wasted. Often, better cameras are larger and weigh more than cameras that have been miniaturized at the expense of quality.
Smaller cameras are more portable.
Size and weight can definitely contribute to or detract from the picture-making process. We all know bigger and heavier models tend to have the most features, but if you wind up taking it along with you fewer places because of its size and weight, that may not be the camera model for you. People on the go tend to prefer compact portable models they can throw in a backpack or purse, while professionals need the larger models which allow for lens options, flash guns, etc. Ease of use. If you can't easily operate the camera, you won't use it, no matter how spectacular the specifications, image quality, or appearance might be.