Potential Spoilers depending on if you live under a rock

I specifically stayed pretty general, but if you didn't know there was a thieves guilde, oops.
(preface: I've never played morrowind):
I'm loving me some skyrim, but when I think back on all the stuff i've done in skyrim and think back on Oblivion, there are more quests in Oblivion that I remember with fondness, like a good book. Skyrim is technically better than Oblivion in every way except for meaningful quests.
Exploring the world: I actually give this a tie. I remember fondly on how gorgeous (at the time), the world was in Oblivion and Skyim is just as gorgeous, again if you take the advancements in the last few years out of the equation.
Caves: Skyrim wins hands down. Each cave is unique, the zombies laying on the shelves and waking up randomly if you wake them, etc.
Opening locks: waaaaay easy in Skyrim which makes the lack of unlock spells a moot point
Spells: Animation is great in Skyrim and varied, but I really miss being able to make my own spells in Oblivion - tie
Quests: Once you're done just exploring the world in Skyrim and really get down to doing all the quests... Oblivion's quests were longer and much deeper and meaningful. - Oblivion wins
Dragons or Oblivion Gates: Both were really cool at the beginning and both get annoying after a while, but Dragons can be killed so quickly and Oblivion gates required a long time to find the ball to close it, so Dragons wins (and Skyrim).
Dark Brotherhood: Oblivion wins hands down. Skyrim's Assassins Guild members wear gay clothing and the quest just doesn't compare to what happened in Oblivion
Thieves Guild: I give this a tie: both are decent length and both interesting
Mage Guild: Oblivion wins. So quick and the results just aren't that meaningful or rewarding in Skyrim when you complete the quest.
Fighter's Guild vs Companions: Oblivion wins. Again, the quests were longer and the result much more meaningful. Companions was incredibly short and although what you get is pretty cool, I really don't use it all that often, unless I go on a momentary suicide run and load back to my prior save.
Civil War: One of the best parts of Skyrim with regards to quests. Having it impact the world and be all around you and even though it's not the "main quest" it really was very well done. Again, the end result is not that rewarding, but I enjoyed having aspects of the quest all around you before you even begin it.
Main quest: incredibly short in Skyrim and although I really enjoyed it, the final battle was pretty quick and was anti-climactic. Oblivion was much more involved and the result was something tangible that made you feel like you did something.