If SS is a lot more difficult than TP, then I'm already voting that it'll be better.
Twilight Princess was a very AVERAGE game. I thought the story and characters were awesome (the concept of the Twilight Realm just blew my mind). But the gameplay....was terrible. Twilight Princess was pathetically easy. You could clearly see what you were supposed to do, and if somehow you didn't understand Midna would just pop up and point it right out to you. Also, there were a lot of weapons, some of them which were new. I liked that, but after you completed the dungeon, you hardly ever used that item again (like the spinning top. It was cool, but after Arbiter's Grounds I barely ever used it). In my opinion, I thought the graphics were awesome, but in another year it'll look like crap. That and everything was so BLAH. The colors were all the same and there was no vivid imagery, even in the Twilight Realm. Not to mention that everything was the freakin same! Oh, look, it's a Forest Temple....and a Fire Temple....and a Water Temple....and a Desert Temple. My god, Nintendo, be creative!
Skyward Sword has....interesting graphics. I'm not really sure what to think of them. They're beautiful, but they're different. And all we've seen is a demo, so Nintendo will obviously polish up the graphics quite a bit before it's released in 2011. We don't know how many items there will be but I'm hoping they'll be utilized more often. The story sounds awesome to me so far. We still don't know crap about that sword-girl (yeah, we know she's the Master Sword, but I kinda figured that out before Nintendo told us) so I'm not going to comment on her. Maybe she'll be as epic as Midna was? Because I LOVED Midna, her character was really well developed. I THINK Nintendo had mentioned something about how they recognized that they were holding peoples' hands as they were playing through the most recent Zelda games and I'm glad they realized that. Because an easy game pisses me off.
Oh yeah, and for the love of all that is pure and holy in this world, please Nintendo....ADD MORE SIDEQUESTS! I hardly had anything else to do in Twilight Princess other than follow the game's main storyline! It drove me bananas!