so are u saying u do a few warm up sets and only 3 sets!out of curiosity how long are ur workouts?
depends on your level of training experience. if you newer to training i feel more volume helps to learn mind muscle connection etc. and you havent yet learned the mental focus/intensity necessary to use lower volume. there is no real answer to your question. the best option would be to cycle different methods while keeping diet and rest consistent. track your progress on each and then decide for yourself.......learn YOUR body.