What ever modern hollow point your gun likes and you shoot well.
I've been wondering this same thing. I plan to try out the Hornady Critical Duty first as i have read a lot of great things about it. I'm still not sure what the main difference is between Critical Defense and Duty?
Here is a good resource, that may help you come to an informed decision:
Best Choices for Self Defense Ammo
Are the Remington HD Ultimate Home Defense rounds basically Golden Saber in a different box with nickle plated cases? Trying to cash in on the self defense market maybe? I believe they cost more than the Golden Sabers too. Please correct me if I am wrong.This. Critical D is good stuff, assuming you are shooting a full-size pistol. Personally, I'm a Remington Golden Saber guy, and have been for years. At the end of the day, there's not enough difference among the modern HP designs to even worry about, IMO.