I find the Fallout series more appealing. Both are fantastic from what I’ve played, but I spent at least 600 hours on Fallout 3, and around a hundred on NV. Skyrim didn’t last me much longer than the time it took to complete the main quest.
I thought it was amazing, but doesn’t have the meaningful choices or combat systems that made me enjoy Fallout. I’ll pick Fallout over Elder Scrolls every time. Hands down.