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 Casio EX-Z550 and Sony W550 side-by-side from the front, back and top in their relative dimensions. Casio EX-Z550 has external dimensions of 99 x 53 x 20 mm (3.9 x 2.09 x 0.79″) and weighs 143 g (0.32 lb / 5.04 oz) (including batteries). Sony W550 has external dimensions of 94 x 56 x 19 mm (3.7 x 2.2 x 0.75″) and weighs 110 g (0.24 lb / 3.88 oz) (including batteries).
Below you can see the front-view size comparison of the Casio EX-Z550 and the Sony W550. Sony W550 is 5mm narrower and 1mm thinner than Casio EX-Z550 but it is also 3mm taller.
Here is the back view size comparison of the Casio EX-Z550 and Sony W550.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Sony W550 is significantly lighter (33g ) than the Casio EX-Z550 which may become a big advantage especially on long walking trips.
Weather Sealing
Unfortunately neither the Casio Exilim EX-Z550 nor Sony Cyber-shot DSC-W550 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
Sony W550's 3.00" LCD screen is slightly larger than Casio EX-Z550's 2.7 screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.