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 Fujifilm X-A3 and Nikon A900 side-by-side from the front, back and top in their relative dimensions. Fujifilm X-A3 has external dimensions of 117 x 67 x 40 mm (4.61 x 2.64 x 1.57″) and weighs 339 g (0.75 lb / 11.96 oz) (including batteries). Nikon A900 has external dimensions of 113 x 67 x 40 mm (4.45 x 2.64 x 1.57″) and weighs 289 g (0.64 lb / 10.19 oz) (including batteries).
Below you can see the front-view size comparison of the Fujifilm X-A3 and the Nikon A900. As you can tell, actually this is not a fair size comparison since Nikon A900 has a built-in lens but Fujifilm X-A3 doesn't. Once you put a lens on X-A3, its thickness will increase significantly.
Here is the back view size comparison of the Fujifilm X-A3 and Nikon A900.
Now lets look at the top view comparison of Fujifilm X-A3 and Nikon A900.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Nikon A900 is significantly lighter (50g ) than the Fujifilm X-A3 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 X-A3, the total kit will weigh much higher.
Weather Sealing
Unfortunately neither the Fujifilm X-A3 nor Nikon Coolpix A900 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 Mirrorless Cameras with Weather Sealing Top Compact Cameras with Weather Sealing
LCD Screen Size and Features
Fujifilm X-A3 and Nikon A900's LCD screens have the same diagonal size of 3.00 inches.
Both cameras feature
Tilting screens where you can change the angle of the screen to make it easier to shoot from waist or over-the-head levels.