Surefire has a great reputation...but you are right it is all personal preference.
I personally carry Olight M20/21 warriors because i got a good deal on them. I was told, and from personal testing, that 90 lumens is a good minimum amount of light for defense purposes.
God gets blamed for a lot of things now days, they ask “why would He let this happen?, Why doesn’t He stop it? I really don’t know, but I wonder if He wants to ask us the same questions. All that is necessary for evil to triumph is for good men to do nothing