a good question...it depends on a number of things
i like to start early in PA with some soft tickling of antlers, followed by a few doe grunts, even fawn bleats sometimes
during the chasing phase of our rut, or during the pre-rut to be more exact, i get into the buck grunts, doe can calls, some more rattling
when the actual rut is on, breeding taking place, i often lay off of the rattle bag and go with estrus bleats, young buck grunts...which really tick off the big bucks thinking they are missing out on something good
but hell, you never know, sometimes calling will bring a buck to you that you had no idea was 40 yards away from you, soft and easy in the early part of my archery season, hot and heavy in the middle/end when the rut kicks in
either way, good luck man!!!