The story in FONV is better, but fallout 4 can be fun with the right mods and playing on survival mode and fo4 has much better shooting/moving mechanics. I have over 3000 hours in fo4, but I keep it interesting via playing permadeath, if I die I have to start over. It is more intense and requires tactics exploring knowing you have to start over and lose 50 hours if you die. But even on survival, I made my own mods to reduce XP (level up much slower), reduce stimpaks (otherwise I will have hundreds), reduce adhesive (supposed to be rare, but is everywhere), reduce ammo, gave AI more damage, etc, and forget power armor, clunky, OP, and unneeded once you meet RR. Otherwise you become nearly invincible in later game. And game is ugly, so I use lighting mods, and "sometrees" mod and grass mod. I wouldnt use other tree/foilage mod other than the "sometrees) as they break precombines and cause CTD and large loss fps in some areas.
But without mods and playing on survival, it can get quickly boring. There are some very good character mods like "im darlene" and "heather casadin" that adds to the story. And bug fix mods "emogene takes a lover fix" and "unofficial fallout 4 patch" are needed to avoid any game breaking bugs.