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 Sony T90 and Sony W320 side-by-side from the front, back and top in their relative dimensions. Sony T90 has external dimensions of 94 x 57 x 15 mm (3.7 x 2.24 x 0.59″) and weighs 148 g (0.33 lb / 5.22 oz) (including batteries). Sony W320 has external dimensions of 93 x 52 x 17 mm (3.66 x 2.05 x 0.67″) and weighs 117 g (0.26 lb / 4.13 oz) (including batteries).
Below you can see the front-view size comparison of the Sony T90 and the Sony W320. Sony W320 is 1mm narrower and 5mm shorter than Sony T90 but it is also 2mm thicker.
Here is the back view size comparison of the Sony T90 and Sony W320.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Sony W320 is significantly lighter (31g ) than the Sony T90 which may become a big advantage especially on long walking trips.
Weather Sealing
Unfortunately neither the Sony Cyber-shot DSC-T90 nor Sony Cyber-shot DSC-W320 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 T90's 3.00" LCD screen is slightly larger than Sony W320's 2.7" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.