I vote niether.
If your a civvy, pointing your gun at someone just to determine if they're a threat or not is kinda stupid. Good if your in a nightime fire fight, bad for searching out bumps in the night.
I prefere a good hand held light instead. Surefire E2d, E2d led maybe. Also you may want to move the light away from yourself. Or you may want to hold the light wrist to wrist. Or maybe overhand next to your temple or a overhand neck hold.
Many different holds for many different senerios and lighting conditions.
Also night sights excel in limited liting conditions. But regular sights still work fine. If you can't see your target, you can't see your sights. And a fat .125" wide night sight is slower during the daytime than a thinner FO front sight.
But this really depends on your eyes. A bit subjective. One pistol for daytime carry, and another for night is the best solution.
Keep in mind that lowlight shooting is terrible. A complete nightmare, like the ones where you can't run and are stuck in slow motion. Only in this case, you can't get a good sight picture with a light, or with nightsights, or with plain black sights. Nothing really works 100% of the time.
Sometimes plain black sights work best, sometime gold button, sometimes Tritium. Only thing that allways works are those little Trijicon reddots that race guns often have.
Lowlight training has shown me that all types of sighting (except 1x reddots) are more likely to fail than work. Sights allmost become a luxery when they decide to work. Pointshooting is king of the dark unfortunately.
Bottom line, I recommend a hand held light, and a front sight that is much thinner than your rear sight notch for the best light contrast. Like a .090" fornt and a .156" rear for example.
If someone had a front nightsight that was .090"wide I'd have that on all my guns. But they all seem to be .125" so I run alot of plain black and FO sights.