Best 9mm
That's a very broad question, too broad for a meaningful question without some clarification. It's like asking what's the best .45. I've got a ball gun, a wad gun, a CCW gun and an S&W 25-2. The wadgun and the 25-2 are NEVER going to be able to change places with the CCW gun or with each other for that matter.
Similarly, while a BHP and a compact Kahr are both good guns, I wouldn't want to carry the Kahr as military belt gun, nor would the BHP do as well as a CCW gun as the Kahr, although it does well enough.
What do you plan to do with the gun? Home defense? CCW? IDPA? Plinking?
I've got a BHP, and while a little large, it is a decent CCW gun. It's also an excellent belt or home defense gun. With the Argentine "Detective" slide and barrel, it'd probably be an excellent CCW gun as well. Cocked and locked doesn't bother me, so I think the BHP is an excellent compromise of size, ammunition capacity, reliability and accuracy. Plus I don't like double action autos (I don't count the Glock). If you've got relatively small hands/trigger finger reach, you ought to at least give the BHP a try, especially the Argentine guns which are very reasonably priced.