Press behind neck is much better exercise to assist bench. It puts more emphasis on the medial lobe of the delt whereas front pressing will always hit the anterior delt more. You need medial delt development for shoulder stability (well until it grinds away the ac joint anyway). Sadly press behind the neck is a young mans lift.
I used to rely upon it and even put 140 up standing behind the neck with only a tiny shove from the legs to start it. Probably why my shoulders feel a bit rough now but conversely it's probably why I can still bench okay after 30 years of benching 1.7 to 2.1 times bodyweight.