The main story of oblivion is much shorter than from morrowind.

I think the world of morrowind is way bigger and way more complex.

you have different houses you cchoose one to join

there are different guilds and religions you can choose.

everything with different quests. And interfering with quests from other choices.

The graphics look a bit old now. You will not get such sunrises as you can see in oblivion.

And that is all without any mods.

I think about start playing it again from the beginning.