i still prefer Oblivion over Skyrim. never could get into Fallouts 3 or NV, never tried four. bought 1 and 2 and actually enjoying those.
I prefer Elder Scrolls/Skyrim but I've played both New Vegas and Fallout 4. Just not a huge fan on the setting I guess. Fallout 4 is super streamlined but its viable to never use VATS ever and just shoot normally which I guess depending on your taste is an improvement.
Elder Scrolls absolutely over Fallout ( especially with how F4 turned out but the less said about that the better. :x ) Out of the ES I've played Oblivion is still my fave.