Post and notch sights are pretty close to being state of the art for reliability and ruggedness. And they're pretty awesome for lack of bulk and complexity.

I strongly prefer tritium sights (and have standardized on them for defensive pistols) but for me it's about rapid sight acquisition in moderate-to-low lighting conditions.

In true low-light shooting with handheld lights or a mounted weaponlight, the light shining off the target and backstop will wash out the tritium, leaving you with essentially a black post and notch.