Fallout 3 is very similar to Skyrim.

I’d suggest that.

If you’re comfortable with modding, in suggest “A Tale of two wastelands” as this merges fallout 3 and Fallout New Vegas into a single game.

Fallout 1 and 2 are very different games. Good, but nothing like Skyrim.

Fallout 4 feels very different, not in a bad way but it’s not got the charm of Skyrim or Fallout 3, that lovely feeling of finding things in a flawlessly crafted world.