Size and weight are big decision factors when you are trying to find the ideal camera for your needs.
In this section, we are going to illustrate the Nikon S100 and Canon S120 side-by-side from the front, back and top in their relative dimensions. Nikon S100 has external dimensions of 99 x 65 x 18 mm (3.9 x 2.56 x 0.71″) and weighs 175 g (0.39 lb / 6.17 oz) (including batteries). Canon S120 has external dimensions of 100 x 59 x 29 mm (3.94 x 2.32 x 1.14″) and weighs 217 g (0.48 lb / 7.65 oz) (including batteries).
Below you can see the front-view size comparison of the Nikon S100 and the Canon S120. Nikon S100 is 1mm narrower and 11mm thinner than Canon S120 but it is also 6mm taller.
Here is the back view size comparison of the Nikon S100 and Canon S120.
Now lets look at the top view comparison of Nikon S100 and Canon S120.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Nikon S100 is significantly lighter (42g ) than the Canon S120 which may become a big advantage especially on long walking trips.
Weather Sealing
Unfortunately neither the Nikon Coolpix S100 nor Canon PowerShot S120 provides any type of weather sealing in their bodies, so you have to give extra care especially when you are shooting outdoors. If weather sealing is a must-have feature for you, check these sections: Top Compact Cameras with Weather Sealing
LCD Screen Size and Features
Nikon S100's 3.50" LCD screen is slightly larger than Canon S120's 3" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.