Wow! 2 totally different resorts in 2 different areas!
WL is a boat ride away from MK, and it's a beautiful resort. The kids would prob love the bunk beds. It's also cheaper then YC. But rooms are a bit smaller too. WL is one of our fav resorts. Love the lobby, grounds, marina- (we like renting SeaRaycers)and walking trail to FW along the lake, so pretty.
YC has SAB, walking distance to Epcot and DHS, rooms are a bit larger, with 2 queens and a day bed, so the kids don't have to share a bed if they don't want to.
One downside IMO is that YC has no food court. You can walk to BC, they have a small CS in the back of their gift shop, The Marketplace.