My prefer final fallout game is fallout 3 and for you?

I'm assuming this is favorite ending? If so, I prefer New Vegas as there were many different ways the game could end.

I like Fallout 1's. It's bittersweet. You save the Vault that bought you up, and you are cast out into the wasteland to found the village of Arroyo and have a daughter who then mentors The Chosen One in FO2 and gives them their mission to find the GECK. That, or if you go with the noncanon ending, you become a super mutant and go and kill the very vault you were born in.

Rather than say favorite, I'd rather say my saddest experience with a fallout ending which was FO3.
I hated that james had to die not seeing his fruit of labor.

I'd have to go with Fallout.  It was the first time I'd experienced something like that.  To me, I was so invested in the character and story that I was outraged.  Pissed off barely begins to describe it.

In fact...:

It would be FNV's if you could continue after it

Think id have to choose one of the earlier first FO game endings, i never played them so i cant say though i have seen a tonne of vids talking about the ending, though out of the ones i have played id have to say FO3, i enjoyed a legion feel ending to NV thou the whole thing for all endings felt so anti-climatic, but at least it did have more mini endings brought up than FO3 so i cant dislike it too much, but all that build up and then boom game over, FO3 ending was more ''damn i need to take revenge for my dad!'' and then thankfully Broken Steel was released so gotta be FO3 for me.

New Vegas because of the options.
My favorite option would be a toss between NCR and Independant.