I settled after changing a max and a pro. My current pro has a good screen. My Apple Watch Series 5 arrived on Wednesday, and I was HYPER happy with it, telling even to my friends it was a better purchase than the iphone 11 pro.
Sadly, I read your post by notified email, and did the stupidity to test the flashlight, the first option of the 3. What I have discovered is a line that splits the screen in two, a bit to the right, like at 55% position left to right, vertically. This line can be seen in white fleshlight, not the red one, but also is noticeable in the Nike spheres I have that fill the screen with the same color. I wish I had not seen the post, now I can't unseen it.
The spheres I plan to use luckily hide the line, but it looks like the right side of the screen after the vertical line has more light than the left, in the fleshlight. When it goes full brightness after some seconds you don't see it anymore.
Can you define what you mean by "Other watch has a slight band down the middle"? Is it a vertical 1px line?