This is one huge appeal to majority man. What ever wins you will accept that as the best album despite your own personal opinion? Still Life rips it for me, but Orchid maybe for someone else, and Watershed for the newbie Opeth fans who love that album because they discovered the machine that is Opeth through that album, like Still Life for me.
Someone else will chose BWP for their own reasons, and someone will not chose an album at all because they feel you can't put a label on art, and I agree. Each album is unique and different to the next, comparing them is much like comparing between the better tasting fruits.