Size and weight is a big decision factor when you are trying to find the ideal camera for your needs.
In this section, We are going to illustrate Nikon S9100 and Sony W710 side-by-side from the front, back and top in their relative dimensions. Nikon S9100 has external dimensions of 105 x 62 x 35 mm (4.13 x 2.44 x 1.38″) and weighs 214 g (0.47 lb / 7.55 oz) (including batteries). Sony W710 has external dimensions of 97 x 55 x 20 mm (3.82 x 2.17 x 0.79″) and weighs 114 g (0.25 lb / 4.02 oz) (including batteries).
Below you can see the front view size comparison of Nikon S9100 and Sony W710. Sony W710 is clearly the smaller of the two cameras. Its body is 8mm narrower, 7mm shorter and 15mm thinner than Nikon S9100.
Comparison image of Nikon S9100 and Sony W710 Size, Weight and External Dimensions - Front View
Here is the back view size comparison of Nikon S9100 and Sony W710.
Comparison image of Nikon S9100 and Sony W710 Size and Weight - Back View
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Sony W710 is significantly lighter (100g ) than the Nikon S9100 which may become a big advantage especially on long walking trips.
Weather Sealing
Unfortunately neither Nikon Coolpix S9100 nor Sony Cyber-shot DSC-W710 provides any type of weather sealing in their body, 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 S9100's 3" LCD screen is slightly larger than Sony W710's 2.7" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.