Re: Unmasked vs Dynasty. I gotta go with Dynasty. Unmasked has some awesome tracks (She's So European is a guilty pleasure) but I think Dynasty remains pretty consistent throughout. Nothing on it is offensively bad and there are some great cuts there, particularly Sure Know Something. The unplugged version of that song is awesome btw.
As far as favorite Kiss album, I'd go with Revenge. Either Hotter Than Hell or Rock and Roll Over would be my favorite of the original lineup