Hi, shanshan, and welcome to BalletTalk.
I'm not sure that anyone can answer you with 100% accuracy, because the theater is still in the process of a major reconstruction, including a total reconfiguration of the orchestra section. I have just looked at the theater's
seating plan, and the rings do not appear to have been changed.
"Better" or "worse" seats depends on what you want to see in the performance. I prefer the upper rings, where it is easy to take in the action on the whole stage and see the floor patterns in the choreography, so I would suggest First -- or even better, in my opinion -- Second Rings. One of the famous moments in Nutcracker is when the tree grows, and that is obstructed once you are as high as the Fourth Ring, but you don't seem to be considering that section.
If you are bringing children and cost (except for the "Sweet Seats") is not a factor, the orchestra is probably best for them, unless someone tall is seated in front of a wee one. That's a chance one always takes.

If I remember correctly, the plan was to increase the rake in the orchestra, so the potential for that problem may have been ameliorated.
The one warning I would offer is to avoid the seats numbered "AA", which are the extreme sides. The view from some (but not all) of those seats is obstructed.
I suppose the best advice I can offer is to call the box office. The staff will be able to help you.
I hope you'll come back to us and share your -- and your companions' -- reactions to the performance.