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 S3700 and Nikon D3200 side-by-side from the front, back and top in their relative dimensions. Nikon S3700 has external dimensions of 96 x 58 x 20 mm (3.78 x 2.28 x 0.79″) and weighs 118 g (0.26 lb / 4.16 oz) (including batteries). Nikon D3200 has external dimensions of 125 x 96 x 77 mm (4.92 x 3.78 x 3.03″) and weighs 505 g (1.11 lb / 17.81 oz) (including batteries).
Below you can see the front-view size comparison of the Nikon S3700 and the Nikon D3200. Nikon S3700 is clearly the smaller of the two cameras. Its body is 29mm narrower, 38mm shorter and 57mm thinner than Nikon D3200. As you can tell, actually this is not a fair size comparison since Nikon S3700 has a built-in lens but Nikon D3200 doesn't. Once you put a lens on D3200, its thickness will increase significantly.
Here is the back view size comparison of the Nikon S3700 and Nikon D3200.
Now lets look at the top view comparison of Nikon S3700 and Nikon D3200.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Nikon S3700 is significantly lighter (387g ) than the Nikon D3200 which may become a big advantage especially on long walking trips.
Again, this comparison may not be very useful in real life as we are comparing the weight of a camera with a built-in lens to the body-only weight of an interchangeable lens camera. Once you put a lens on D3200, the total kit will weigh much higher.
Weather Sealing
Unfortunately neither the Nikon Coolpix S3700 nor Nikon D3200 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 Top DSLR Cameras with Weather Sealing
LCD Screen Size and Features
Nikon D3200's 3.00" LCD screen is slightly larger than Nikon S3700's 2.7 screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.