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 Olympus SZ-15 and Nikon S3300 side-by-side from the front, back and top in their relative dimensions. Olympus SZ-15 has external dimensions of and weighs 250 g (0.55 lb / 8.82 oz) (including batteries). Nikon S3300 has external dimensions of 95 x 58 x 19 mm (3.74 x 2.28 x 0.75″) and weighs 128 g (0.28 lb / 4.52 oz) (including batteries).
Below you can see the front-view size comparison of the Olympus SZ-15 and the Nikon S3300. Nikon S3300 is clearly the smaller of the two cameras. Its body is 13mm narrower, 12mm shorter and 21mm thinner than Olympus SZ-15.
Here is the back view size comparison of the Olympus SZ-15 and Nikon S3300.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Nikon S3300 is significantly lighter (122g ) than the Olympus SZ-15 which may become a big advantage especially on long walking trips.
Weather Sealing
Unfortunately neither the Olympus SZ-15 nor Nikon Coolpix S3300 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
Olympus SZ-15's 3.00" LCD screen is slightly larger than Nikon S3300's 2.7" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.