Exercises like these (behind the neck push press) have the main focus on power, speed and strength. The muscle fibres addressed are the fast-twitch ones i.e. type 2. The slow twitch one (type 1) are more for resistance training aka bodybuilding style, high reps 8-15, longer time under tension etc. to increase that muscol volume. I found that my muscols react much better when going for fast twitch training.
Quick test to found it out. Take 80% of your 1RM (squat, deadlift, bench, overheadpress or whatever) and do a AMRAP (as much reps as possible)
< 7 reps: fast twitch dominant
7 - 9 reps: balanced between slow and fast twitch
> 9 reps: slow-twitch dominant
I personally think stimulating both types of fibres through different reps, sets, rest, tut etc. will help you get the best of both worlds for increasing strength and size.