honestly probably fo4, though its a close match with fo3
the gameplay improvements and loop just entertains me for significantly longer, despite fallout 3 having better atmosphere, and fallout 4 having a lot of issues in practically every part of its design
at least besides far harbor, my beautiful baby boy
i actually prefer the power armor in fallout 4, its more accurate to the lore and feels a lot more imposing and impressive
it coukdve used a lot of balancing though, especially regarding power cores