After talking with the wife, she'd rather spend the extra $500 and stay at the Cosmo. I think she likes that it is a "resort" and will probably have more of that type of "feel". We've stayed (almost always on points) at many different MVCI properties, as well as, many different Marriott resorts. So she well knows what the GC will probably be like. Plus the Cosmo does have an onsite Spa which I have the feeling both my wife and daughter will be availing themselves of and 3 pools (rather than just 2) of which they all look larger and a bit nicer than the GC pools.
So while I am on the GC side, I think the girls are on the Cosmo side. So right now they outvote me 2 to 1.