Hi Kirsten,
Thanks for visiting Disney Parks Moms Panel.
Let me say at the start you are looking at some stellar resorts for your Walt Disney World vacation. I love the Epcot Area Resorts for their charm, their themes and decor, their beautiful Crescent Lake surroundings, and — of course — their convenient walkability to Epcot. Each of the Walt Disney World Resorts you mention offers a 2-bedroom layout with 2 bathrooms.
Disney's BoardWalk Villas and
Disney's Beach Club Villas offer 2-bedroom villas that feature a fully equipped kitchen. The typical 2-bedroom Disney's BoardWalk Villa is a bit more spacious than a typical 2-bedroom Disney's Beach Club Villa.
Disney's Yacht Club Resort offers a 2-bedroom suite, though it does not offer a villa-style with a full kitchen. One wonderful amenity for Guests at Disney's Yacht Club Resort and Disney's Beach Club Resort is the amazing
Stormalong Bay. It's my favorite pool area in Walt Disney World (to be honest, calling it a "pool" does not do it justice).
Kirsten, I think any of these resorts you're considering will provide a perfect space for your magical Walt Disney World vacation. If you have more questions about your planning, please visit us again here at Disney Parks Moms Panel.
Enjoy your Disney!
Jerry