Both awesome, but totally different. Look at decor pictures and decide. The pool at WL is better than CR. If you have younger kids, the bunk beds are always a hit. The WL pool is my favorite for the 5 and under set (nice, easy slide they can ride 50 times in a row without missing a beat).
That being said, BLT is my favorite (usually stay there on points vs. CR), and the ability to walk to/fro MK is pretty fabulous. More modern/sterile design which is offputting to some, but I remember staying there as a child (nostalgia), and am a fan of modern design.
So...you have picked two of my favorite resorts. I would also argue that BC/YC (I prefer YC) is the top of my kids list currently because of SAB. It is wonderful. Also, you have that extra daybed in most rooms, giving you some extra breathing room (have that at CR, but not WL).
So...good luck!!