... a 26 jewells COSC certified movement. The Army model information tells that its movement is a 25 jewels and don´t mentions it is so certified, so it seems to be a different movement. My experience with my Sub 300 is that they are very accurate. I didn´t run any "home test" with my just arrived Army.
Now, regarding dial colors: of course it´s a very personal matter. I own three colors: The orange one is the iconic dial of Doxa.
Then I own the silver Searambler which is my favorite as I find it very elegant and under the radar, and finally I also have the black Sharkhunter which is a typical/classic black dial diver watch which makes big contrast with its orange minute hand and white hour hand making the easiest to read the time.
Going back to the Army and Sub 300 comparison: The case is identical, same depth rating (300 mtrs) and is equipped with an Helium valve (which sport divers don´t need and even most pro divers will not need if they don´t work in saturation type dives).
The bezel diameter of Sub 300 and Army is also the same 39 mm. And the dial window is the same diameter 27 mm.
But there is a big difference here: In the Army we see the full 27 mm dial but in the Sub 300 we see just around 23 mm of the dial due to the thickness of its domed glass which covers some millimeters of its dial. That´s why the watch dial looks a bit small in regards with the size of its case while the Army looks like having a larger dial.
May be my pictures below help to illustrate my point better than my words.
I hope these thoughts helps you! Cheers! Abel
PS: please note that the silver and black dials belong to the Limited US Divers edition offered a few years ago but anyway they can give you an idea of what I explained about the apparent “smaller” dial of the Sub 300 due to the big thickness of glass.