The 3 position allows you to unlock and cycle the bolt to load and unload the gun with the safety on. A good idea - I think.
Safe gun handling should always prevail over the idea that the safety is your first and last line of defense against an accident.
Having said that, I always opt for the Ruger or "Model 70" safety (3 position on the bolt) for bolt rifles I will be using in a treestand because I regard them as the most positive should I ever drop my loaded rifle from a tree. (Never have, never intend to, but I feel better with one.) Some safeties are little more than trigger blocks, some interfere with other linkage, sear or trigger. The Ruger locks out the the trigger and the cocking piece. When I am in a tree - I appreciate the "extra" safety engineering, and think it is well worth having.
On foot, over a bench, I feel fine with most other safeties. Again, safe gun handling ALWAYS prevails.
Every once in a while I hear some decry the Model 70 style safety, or Ruger safety as slow to get into action. After over 50 years of using Model 70 safeties, and later Ruger safeties when the 77 MkII's came out I would have to disagree with that. Any rifle or shotgun I have ever used, the safety became second nature after familiarization. I like the positive indication, either by sight or by touch, that the 3 position bolt safety gives me as well.