The
Beach Club Resort or the
All Star Movies Resort? To begin, the Beach Club is a deluxe resort so you will have more amenities, a larger room/bathroom, balcony/patio, more dining options (including character dining), easy access to Epcot and Disney's Hollywood Studios by walking or water taxi; however, I don't know if those things will matter much to a 1 & 4 year old. What they might enjoy is the 3 acre Stormalong Bay, which is nearly like a water park with its sand bar, sand bottom pool, and lazy river. They may also enjoy the movies on the beach and a chance to roast marshmallows by a bonfire. However, the cost of this resort is going to be substantially more.
At the All Star Movies, there are HUGE icons from popular Disney movies throughout the resort that could be quite magical for little ones. There are two pools and a kiddie pool. I just asked my family their opinion on what young children would like best, and they all said All Star Movies because it is so visually appealing. I do want to point out that unless you have a car, you will need to use a bus to get to the parks, and often the walk to the bus stops at the All Star resorts is longer and often more crowded.
I hope these pros/cons help you to decide. I'd see, too, the difference in cost to see how that affects your budget. You may want to explore the links above as well as www.allearsnet.com that has extensive photos of both resorts.
Finally, I have to admit I like the dining plan because I like to have one meal where we don't have to stand in line and carry a tray of food, especially when we had our hands full with toddlers.