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 GoPro Hero9 Black and Sony H400 side-by-side from the front, back and top in their relative dimensions. GoPro Hero9 Black has external dimensions of 71 x 55 x 34 mm (2.8 x 2.17 x 1.34″) and weighs 158 g (0.35 lb / 5.57 oz) (including batteries). Sony H400 has external dimensions of 130 x 95 x 122 mm (5.1 x 3.74 x 4.81″) and weighs 628 g (1.38 lb / 22.15 oz) (including batteries).
Below you can see the front-view size comparison of the GoPro Hero9 Black and the Sony H400. GoPro Hero9 Black is clearly the smaller of the two cameras. Its body is 59mm narrower, 40mm shorter and 88mm thinner than Sony H400.
Here is the back view size comparison of the GoPro Hero9 Black and Sony H400.
Now lets look at the top view comparison of GoPro Hero9 Black and Sony H400.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
GoPro Hero9 Black is significantly lighter (470g ) than the Sony H400 which may become a big advantage especially on long walking trips.
Weather Sealing
With its weather-sealed body, we believe that the Hero9 Black has a big advantage over the H400 which doesn't provide any kind of environmental sealing.
LCD Screen Size and Features
Sony H400's 3.00" LCD screen is slightly larger than GoPro Hero9 Black's 2.27″ screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.