I'm going with The Elder Scrolls, no questions asked.
A friend gave me New Vegas as a gift and I got bored rather quickly. Oblivion and Skyrim, on the other hand, have both kept me entertained for a very long time.
The only thing I'd take out of New Vegas to include it in TES would be the "Hardcore" mode, or survival mode. And even then, it would be appropriate for Skyrim but not necessarily for Oblivion, which was set in a much more "tame" environment.
A friend gave me New Vegas as a gift and I got bored rather quickly. Oblivion and Skyrim, on the other hand, have both kept me entertained for a very long time.
The only thing I'd take out of New Vegas to include it in TES would be the "Hardcore" mode, or survival mode. And even then, it would be appropriate for Skyrim but not necessarily for Oblivion, which was set in a much more "tame" environment.