So I realized I had a dyslexic moment...thought the OP was going from Oblivon to Skyrim. Oops, it's the other way around!
More wildlife that isn't going bezerk trying to attack the PC...that's what I would want. Skyrim has bunnies. Goats, deer, elk, walruses, etc. Cyrodiil only has deer. Skyrim's wilderness is therefore a bit more authentic.
Also, Skyrim's enemies which
do attack (wolves, tigers, etc.) can sometimes abandon their attack if the PC gets too far away. That's one of the things that irks me about Oblivion: if you get attacked by a wolf, yet don't want to bother attacking back, that wolf is now going to follow you FOREVER. It will never tire. Never give up its pursuit.
From far back in the crowd
...boo! ... boo!