Oblivion pros
More interesting main quest
Class and starsign system
More varied and interesting world
Two chances to edit character
Game pauses when talking
Skyrim pros
Better character creation
Better levelling system
Better magika combat
Bashing
Civil war
Inb4any other Bethesda games
Inb4dark souls
Inb4anything else
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Oblivion had a more interesting overworld in my opinion, though the Dungeons in Skyrim were slightly more interesting. Melee Combat still sucked in both, and the Magic System was uninteresting.