Like you, I used to do both presses and
lat machine both front and rear. Behind the neck presses were supposed to hit the medial delts more than military presses
which were believed to work the anterior
Also, the conventional wisdom I
had access to indicated that rear pulldowns
built the upper part of the lats more than front ones. Some of this cw probably came from the fact that Steve Reeves did behind the neck chin ups and Frank Zane did both movements to the front and to the rear.
More recently, we are advised not to do either movement to the rear for fear of injury. I have made the change as an injury is the last thing I need. I had
actually abandoned military presses and had gotten quite comfortable with behind the neck presses.
When I did try military
presses I found I couldn’t use as much weight as I did behind the neck. Now I
wonder if I may have lost some flexibility
and rom by doing them that way. For pressing
I generally use dbs now as I am getting a
bit long of tooth. They are a bit harder to handle so they work the core but I feel safer with them.
Some trainers say behind the neck presses are okay as long as you don’t go down past
the level of your ears.
Hope this helped.