The idea of a stall is to keep a horse confined, so you can walk down the aisle and so can the horse you are leading, without being greeted/attacked.
The best is a door that is complete, but part of it can be folded open for the few horses you want to stick their heads out.
Any time you have an opening out of a stall, sooner or later some horse will have a silly moment and try to exit thru it, so think if you really want anything open a horse may get out thru or get hung in trying to get out.
Personally, I have never seen sliders that don’t eventually get clogged up and out of line.
Swinging doors are much easier to adjust.
I have not seen swinging doors that you can’t, if they do, easily mount one or the other side of the latch higher or lower.
Sliding doors won’t use room in the aisle, but they may strain your arm and shoulder from the motion you have to use to open and close them.
With swinging doors you don’t have any such ergonomic concerns.
One door a day, no problem, many doors many times a day, maybe.
It is all about trade-offs, what you love to see in your barn, what is sensible, only you know what would work best for you.
Here are some pictures of stalls, some with openings you can also keep closed:



