Since we are discussing pros and cons, I cannot let the pool go. It's awesome. It's unique. It was also the biggest stresser for me. That is one huge pool, and there are so many curves and areas that block vision. I know your child is younger than my grand daughter was, but I was a nervous Nellie there. Kady was a strong swimmer, and the life guards are vigilant, however I was not always able to keep eyes in her.
I would suggest you look at why you would choose any resort: convenience, transportation, theme, amenities, and grounds. Of those, what will you use?
My family prefers the MK resorts, they love the Poly. For all the above. Walking into Epcot matters not to them, and while they like the Boardwalk, it is incidental to them. SAB is nice but not their deal breaker.
I really gravitate towards the BC. I live the Boardwalk area and the easy acces to Epcot. The pool is a non issue, itvis too crowded for me.
I suggest you look at all of this, decide what you will use, appreciate, and what cons are in store for any resort. They exist at each one, so the pros need to trump the cons.
Then decide. I will say that I consider wilderness lodge a MK resort, even though it is not on the monorail line. If you are looking for a change in atmosphere but do not want to give up convenience, consider it among your choices.