3 is better for everything.
Even story? So you would rather have:
a rehash of the older games
"Hey you are ghoul, go in there and turn on the pump."
Ghoul: "No forget that."
"Fawkes plz :3?"
Fawkes: "okay"
Ending: Fawkes was the real hero in the end and the water was made drinkable once more so your piss wouldn't glow in the dark.
vs
A story of group conflict and history
"This Dam belongs to us now!"
Ending: "The courier has brought peace temporarily in the region for the time being. Your actions has shaped the future for many. However man has yet to learn from his ancestors previous mistakes as the courier fades into obscurity as part of the wasteland. War never changes."