For sandbox in PC Fallout 3 with Weapon Mod kits (Suppressor for Sniperrifle), DC Interiors (more doors to go in stores), some texture packs, Marts mutant mod (For more enemies like Fat man singing while evergreen mills exterio has 40 raiders), Apocalypse Armoury (If you can find it, more guns and deadlier guns to you and ENEMIES. Think Suoper mutant lord with Gattling plasma EEEK), RobCo for making OWN robot army
For Story wise New Vegas (Far more better story and dialog)
For Minecraft meets Fallout Fallout 4 (I have 7 settlements builded)