Just make sure that you go to failure on each and every set. Otherwise, there isn't enough stress being placed on each muscle group to stimulate maximum growth, or any growth in my case. I personally choose the 6 days per week routine, working each group:
-To Failure on as many sets as I can
-10-16 sets per muscle group
-Pyramid with timed rests
-Always with a w/o partner
-Drop Sets on the last set of each exercise
Otherwise if I don't include these metrics/definitions in my routine, I don't grow. But that's just me though.
If you ain't limpin out of the gym, you ain't making progress.