Respected and Used?
The wording of your question gave me pause, because this is so subjective. Please consider the concept of "skills, not gear" and remember that I will always say that the choice of equipment is only a part of the equation. I have four 3rd gen pistols each of which I respect and use, and the differences between them are unimportant in my training and practice. They fight the same way.
I think I can give you a real and valuable answer though.
-If concealment is paramount in your thinking, then the 3913 is the way to go. It is a thin single stack 9mm.
-If large caliber is paramount, then use the 457.
-If magazine capacity is paramount, then use the 6906.
Other commenters on your thread have correctly pointed out that there are either cheaper and/or more expensive versions of these pistols available.
I considered the same question in 2005 and settled on the 457 when I learned that LAPD officers who carried the 4506 on duty, preferred the 457 for off-duty, and plainclothes officers in those departments also used the 457.
-I am very satisfied, and I have worked hard to become competent with it.
-The finish sucks, so I sent off to cerakote the slide.
-The sights are plastic so I put trijicons on it, after I dropped it on a concrete floor and crushed the rear sight. The pistol was not scratched because the plastic took all the brunt of the fall.
-I have dry fired the trigger into a smooth sweetness.
-I have never had a malfunction or misfeed of any kind with any type or brand of factory ammo, though I once had a failure to cycle from an undercharged reload which was given to me, all of which I immediately destroyed.
- In my two hands, unsupported, standing, at practical shooting speed, the 457 routinely prints into 3 inches at 15 yards.