From a gameplay perspective the secret end, just the solo walk and that music starting makes me sit up an take notice, i just love it especially as either a old skool head popping slow motion pistol wielder or a in your face shotgun maniac
Narrative perspective is harder to choose for me as i normally put into that how it made me feel and if im being brutally honest with myself i dont think i have allowed myself to feel much or become absorbed enough to feel much. I think the only time something really hit home was when i seen there was a suicide option and, again if im honest, i decided to do it just for the shits an giggles, this was my first playthrough and there normally just done to get to grip with the game hence i went meh see what happens, i dont honestly think i was ready for them credits like at all, anger, pain, disbelief, everything was there and nothing was held back, the judy scene must be one of thee most gut wrenching scenes i've witnessed in gaming if not thee most and it physically hurt to watch. So i guess from a narrative/choice/consequence perspective it would have to be that, the rest, for me, pale in comparison so far.