I have three different rounds available to me. I have Federal HydraShock 165gr., Winchester PDX1 defender in 165gr., and Hornaday Critical Duty in 175gr.
Which of these three would you choose? I want to use these because it is what I have, and do not want to go out and buy a bunch more ammo.
I would have to vote for "none of the above."
Remember, the Federal 165 HydraShok (P40HS3) is a low-velocity load made for the FBI (they no longer use that load), and it was designed to make the .40 S&W into a 38 Special. They now use the Winchester PDX1 .40 with the 180 grain bonded hollow point (packaged in white boxes, with a "Q" product number designation).
If you like the 38 Special, you might as well get a 9mm. If you get a 9mm, the new Winchester RA9B has already developed a fantastic reputation on the street. It is the only 147 grain load I would trust. You get mild recoil and higher magazine capacity. It is a little better than the FBI contract load in 9mm, the Q4364. RA9B uses the PDX1 bullet, which was developed after Q4364.
The .40 PDX1 is not much heavier than RA9B and goes only a tad faster, so I cannot imagine a great increase in performance.
I do not see that the Hornady load has enough "street performance" and I have no experience with it, so I would not use it. The 165 HydraShok is ok as long as you understand you are getting a 38 Special, but the bullet technology is older than PDX1, and FBI got away from it and changed to a faster, heavier bullet, if that tells you anything.
Of the loads available, I suppose I would get the 165 grain PDX1 and use that until a better choice comes along.