I really got deep into Fallout 4 with the introduction of settlents and romance options. I really enjoyed the followers, Monica the most but Fawkes (from FO3) was a good one.
One of the things I loved about FONV was the introduction of the AntiMaterial Rifle where I could snipe oneshot deathclaws from a distance with armor piercing. What I loved most in FO3 was the ability to use the Chinese Stealth suit and I took full advantage of it even against Deathclaws where I could sneak up and oneshot them with a supersledge. I started playing Fallout when Fallout 3 came out, then grew into the GOTY edition with all DLC.