Upper Sideline vs Lower Endzone?

It's not bad. At least you can see the whole field. It allows you to see things before they develop. Busted coverage, big hole opening, etc.

Never sat in the lower endzone so I can't really compare the two.

For 20-something years, I have sat in the "curve" of the north end zone, across from where the band used to be (section 210) I would not trade it for anything, except the club. (mostly because the club is air conditioned and has lots of great food) Take the North endzone - you will not regret it. 25rows up is fine. Lots of action in that section, guess cause of the band and students, etc. They really get into the cheering, dancing, etc.

The lower upper deck around midfield is the best seat in the house.

I've sat in the West Upper once and didn't like it because of the location of the band. My tickets are in the East Upper and I love it because you could see and hear the band and that makes it feel like you're in the game.

With the band being moved, West Upper should be fine.