When it comes to albums that are signed by all of the members of the band, a record that is signed by all of them will sell for considerably more money than one that only has the signatures of some, but not all, of the members.
Personalized albums, which have a personalized message on it, tend to fetch a lower price than records that have just the artist's signature on them. Autographed records that have other evidence attached, such as a photo of the artist signing the record, tend to fetch the highest prices of all.