Before the days of me shooting with moveable screens, I admittedly liked the look of the M5 style pull out screen, being a bit of a symmetrical freak I liked the idea of the screen more or less being always in the middle of the camera body, and for landscape orientation photography that is still true.
However where the fully articulating screen shines is in portrait orientated photography, granted it isn’t as good for landscapes, pulling the screen to the side of the camera to the left of the lens isn’t as good, but still the articulated screen is a far better combination for general photography.
So, if you are still going to shoot a mixture of portrait and landscape orientation photography as many photographers will do, then the fully articulating screen is the one to go for.
If on the other side, you only ever plan to shoot landscape style photos and videos the M6II style screen may appeal more to you.
All this only ever matters if you are going to shoot using the back of the LCD screen, if you only ever plan to use the EVF then I guess it doesn’t really matter.
When shooting portrait style photos, it is so much more comfortable to look at a screen in a vertical position with the benefit of being able to then also move the screen backwards and forwards. I think you must try it to be able to fully appreciate this, it was the case with me at least!
You must shoot with them both to fully understand and appreciate this and having owned camera bodies with both styles of screens this is my opinion.