The W-800H is bigger than the W86 in every way. Larger screen, thicker (see the picture below), and has bigger buttons.
There's just something about the W800. It's too digital, if you know what I mean. Numbers everywhere. The screen is too reflective, and the actual read out (the time, date etc) is overly large for what I prefer. Regardless of my opinion on this watch, other people love it.
And to be fair, it does provide a lot of features for the cheap price. 100 meters water resistance, alarm, stopwatch, and it has a 10-year battery life. It also has an Illuminator light, but its certainly not as good as the Illuminator other models have, such as the W-86 (One of the best) and F105.
Casio W-800H (left) Vs Casio W-86 (right)
It's still decent, though, and much better than the poor micro light seen in the F91W. There's also a mod that can be applied to the W800H that gives it the ability to be used as a countdown timer. Lots of instructional articles and videos on how to do this online. These can be found on YouTube, Reddit etc.
