Either one of these full workouts lead to a point where it's impossible to increase the pump anymore. In fact you might feel the pump going down if you do too much, which is a bad sign...
I'm all for volume, but the body does have a limited capacity to respond to stress.
The videos are being uploaded right now.
You can do both if you decide to specialize on your shoulders for 4 weeks. But this means doing them on separate workouts, and reducing volume for other body parts.
When I specialize on a specific bodypart I train it 3x a week and reduce the rest of the body into 2 workouts and reduce volume for the "other" (non spec muscles) otherwise the body will not be able to recover.
For example you could do:
DAY 1 - Back / Biceps
DAY 2 - Shoulders heavier (presses) / Chest (minimal)/ Triceps
DAY 3 - OFF
DAY 4 - Shoulder pump work (Growth Factor Training)
DAY 5 - Legs
DAY 6 - Shoulders pump work (width exercises)
DAY 7 - OFF
When doing a shoulder spec program you can maintain a decent volume for back, legs and biceps (still lower than usual, but not too much) BUT chest work REALLY has to be reduced to a bare minimum since pretty much all chest exercises do involve the chest. So I'd do maybe 3-4 sets of a press exercise for the chest and 3-4 sets of an isolation exercise, MAXIMUM. And I'd put it on the heavier shoulder day so that the shoulders will get enough rest during the week.