I love both resorts but for the past few years we've stuck with the contemporary and love it. It's so nice to be able to quickly walk back and forth to the mk without waiting for a monorail or boat. The mk view rooms feel like we're staying right in the mk and the view of the fireworks is amazing.
We moved over to the contemporary from the poly when all of the renovations started at the poly. Now, I don't think we'all go back. The new bungalows block a lot of the views and you can't walk to the mk.
Also, we always eat at the California grill and chef mickeys every trip so the contemporary is just better for us.
I should also mention that we really like having everything in the same bldg. the poly is all spread out. There's the lobby bldg and then you have to go outside to walk to your bldg. At the contemporary, the arcade, gift shops, front desk, restaurants, etc are all in the tower and we stay in the tower. Even if you stay in the garden wing, there's a covered walkway that connects to the tower. I do like the poly theme.
The standard rooms are pretty similar... one bathroom and 2 double beds plus a daybed. We have 3 kids and my oldest son always gets the day bed.
Have a great trip!!