I only recommend mechanicals to people shooting over 60 lbs and at least a 28" draw length. You will almost always get more penetration out of a fixed blade broadhead. Shot placement is more critical if you hunt in thick cover, if you hit a whitetail anywhere in a 6" circle with a sharp broadhead you shouldn't have too much tracking to do! If you do go with mechanicals shoot a quality head. Like that of Rage, Tekan II's, or Grim Reapers. A lot of people praise spitfires, but if I can't get a mechanical broadhead to deploy by pushing it through a piece of construction paper I WILL NOT shoot it at an animal. Try that test with a spitfire!
I just filed for this years gun tags, can't believe its almost that time of year again!