Fallout is a far more superior rpg. And fallout excels in choices. Most quests have like 3-4 options with more unlocking with your skills/perks/attributes and covering every aspect of roleplaying. Whether you want to be evil or benevolent and good or a mercenary who cares about money or just a selfish bastard - they cover everything. Even side quests and especially FNV. There is almost not a single fetch quest as even with the most simple-looking quest, there are more things at play than what you would expect. It's an unfair comparison, really.
PS: oh and each choice usually has actual impact in the game
Well, that can be mostly credited to Obsidian's writing team, if only their handled the technical side half as good as they wrote, they would be serious competition for BioWare if you ask me. They're not though, but Bethesda should really look at how Obsidian (And BioWare for that matter) write stories, quests and dialogue.
I love TES games, Morrowind is probably my favourite game of all time, but the one complaint I have always had is this, my character never really feels like a well developed character. I know the blank slate is meant to let us decide for ourselves who our character is, but there is no way to let the game know that and so the game doesn't have the means to respond in the right way, thus every character is pretty much treated in the exact same way, often to the letter. In the end that means my choices don't really matter in the grand scheme of things, they have no impact. Why choose to spare someone when I can kill them and steal their stuff? The game doesn't care either way, why should I?
I could go on, but I've stupidly pulled an all nighter and need to shop for christmas presents today...so that'll be awesome. Point being, I am in no state to write out a full essay on the subject.
Bottom line is this. While I love Morrowind and I've put several hundreds of hours into it, TES games in general all suffer from the "problem" mentioned above, my characters never feel iike they evolve or change in any meaningfull way. Obviously I'm not talking about levels, stats, skills or anything like that, but actual character development. There is virtually none to be found and it is the one thing that keeps me from truly enjoying Skyrim, it's one of the things that kept me from enjoying Oblivion. If I am to make choices in a game, I want those choices to matter, right now they really don't.