Best? I cannot say what is best for SD ammo. I can only give my opinion. It is my opinion that a good 1911 loaded with 230 gr. FMJ's will be very effective at across the room/down the hall distances for SD/HD. Such a round eliminates any concern about expansion. There will be none. Such a round eliminates any concern about lack of penetration. There will be plenty. Properly directed to the center of mass the result should be that the subject will immediately calm down and cease to be a threat. If this is not the immediate result, one can always fire another shot.
As to the potential of over-penetration, just about any SD/HD round will completely penetrate a subject. There might be some individuals who will be so large that this would not be a problem. But typical men are not NFL linebackers. And on typical men, just about any decent SD/HD round will almost certainly exit unless it hits a obstruction of bone, etc.
My own thought is that should it ever be necessary to protect myself or my family in a SD/HD incident, I want the round I employ to give sufficient penetration that vital organs, etc. will be reached regardless of the angle at which engagement occurs... or what barriers might be interposed.