I love the Fallout series and Fallout 4 has a really good story and some very charming and fun characters (Hancock my beloved), but imo it's not as good as new vegas (although that game is a masterpiece so i can't really compare them)
Also, building and managing your settlements was the most fun part of the game for me, especially with mods.
Also, building and managing your settlements was the most fun part of the game for me, especially with mods.