I've never stayed at the Poly, but have stayed at Beach Club many times. The beds are comfy, the decor is a soothing beach cottage theme (which feels like home to me), the bathrooms are a nice size with the sink separate from the shower/ toilet. The pool is AMAZING with sand on the bottom, a major perk. There is also a pirate themed water slide! The pool area also has a cute diner themed restaurant. If you like steak, the Yachtsman Steakhouse is a short walk to the Yacht Club next door. I love taking the boat as transportation to the Boardwalk area, which is charming with great shops and restaurants. Overall, the Beach Club area is just very nice to take a relaxing walk around in the evening after a day in the parks. Epcot is within walking distance and Hollywood Studios is a boat ride away. There aren't a lot of food options at Beach Club so my family and I always just had cereal and bagels in our room. I hope this is helpful! I'm sure you'll have a wonderful time regardless of where you stay!