A matter of taste. They're completely different beasts, one being a mostly by-the-numbers JRPG and the other being a mostly by-the-numbers WRPG. Which you prefer is up to you.
Originally Posted by Spuuky
Oblivion is kind of boring. It's pretty and all, but I don't find it immersive. It feels so generic/empty/lifeless. I can't really think of a completely accurate word.
I can think of three (and a half) : It's not Morrowind.