Hello, sir. What constitutes the "best" sights for the HP is very subjective,i.e.: what I like might not be your cup of tea!
Novak fixed sights as well as Heine's are considered top fixed sights for the HP; I'm told that the latter brand are made of harder steel, but cannot confirm that as I've not dinged my Novaks.
On a couple of my MkIII 9mms, I had a local smith install plain black-on-black Novak fixed sights with a semi-post (serrated). I had the rear sight notch opened a tad for these aging eyes.
Guess what? When firing either of these HPs against a MkIII with its factory fixed sights, I gained nothing in speed/accuracy and in bullseye shooting, groups were equivalent! Still, I wouldn't change them back as they add a bit of class or a panache to the gun's looks!
I had an officer under my command who had a set of the MMC adjustable sights put on his .40 BHP. They held up well to the rigors of patrol duty and he was able to hit with them and they did seem to hold "zero" once set. I find their sight picture a bit cluttered, but, again, that's subjective.
One of my HPs has Bomar adj sights low-mounted and they've held up good for twenty years as have a set of S&W K-frame adj sights on my oldest HP. I'm not sure if they're still made, but I had one HP fitted with Wichita sights, kind of like Bomars on steroids. The sight seemed good, but was just too big for the gun in my view.