Before I would advise you on any Macaw or Large Parrots, You really need to do your homework and know what your getting yourself into.
Out of all the Macaws, the Hy and Green Wing are the best choice of the Macaws by far. They're known as the gentle giants of the Macaw world. They can be expensive. They demand your attn. they require lots of space and the biggest cage your can find and afford. They can be pretty dangerous if not handled correctly. Their bite is very powerful and should not be around small children.
I would advise you to search a local brid club in your area and go to one of their meetings, most club members bring their birds to the meetings so you can interact with them and know first hand what your getting yourself into.
B&G can make wonderful pets as well but are known to be nippy and as they mature, they go through ups and downs on mood swings.
If it's the color that made your change your mind from the GW to B&G. I would advise you to look into the Blue Throat Macaw first. They are much easier to handle and smaller then the B&G. Best of luck and please do not rush into purchasing a Macaw just because you want one. Thanks Joe