Are the Spanish dialects of AsturLeonese better preserved than the Portuguese dialect Mirandés?

Answer 1

No, they are not. The difference is because of the laws that regard preservation of the languages in both Spain and Portugal. In Spain, specifically in the area of Asturias and Leon, there isn't too much interest in preserving the language and thus there isn't much autonomous or government support in the form of legislation of language preservation funding like there is for languages like Galician and Catalan. However, in the Portuguese area of Miranda de Douro, there is significant support for Mirandese, albeit lower than Portuguese, that stills allow the community to preserve Mirandese somewhat in road signs and in speaking to local offices (It was even recognized by the European Bureau of Lesser-Used Languages!).