My title of choice would probably be Daggerfall because it’s just so ambitious and truly offers an experience none of the other elder scrolls games offer. That being said it is kinda an example of a sequel eclipsing it’s predecessors as well given it is more or less a straight improvement over Arena in every way.
Easily New Vegas and Interplay fallouts (excluding tactics ofc). Put an easy 150 into FO4 but New Vegas really isn’t overrated, and 1/2 are amazing with the sheer desolation and creepiness factor. Love those games, probably played NV a dozen times by now