I just spent weeks mulling over a white bag too! Both the Muse and the Balenciaga were on my list. It depends on what you are looking to use them for. Because the Muse is structured, I feel like it is a bit more formal, professioanal. The balenciaga is hot! I think it if more a bag for going out.
P.S. Just discovered TPF, didn't realize others love/obsess bags as much as I do! Love it!