Never played either of them
Skyrim looked a bit interesting but Fallout was just not attractive to me.
I did the Morrowind and Oblivion thing and liked the games never got around to Skyrim
Civ-6 Oh yeah. That I play
As a guy near 50 that played D&D with dice, Skyrim was just fantastic. Played through the end 3 times and still get on to dabble maybe once a month.