Closest in vocabulary probably Mexicans, who speak "post cervantino" Spanish even though some words differ substantially. In correction, probably Colombia.
Not in pronunciation though. Argentinians probably the most different together with Puerto Ricans and Dominicans and Cubans (spoken language).
I think the best place to learn is Spain, because Spanish here is like sort of the origin of all the Spanish spoken and Castillian is definitely the best. The best place in Spain is also important: Castilla y León, Madrid and CAstilla la Mancha. In other areas you might get the local language, too.
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 “Los hombres son superiores a las mujeres porque Alá les otorgó la primacia sobre ellas. Portanto, dió a los varones el doble de lo que dió a las mujeres. Los maridos que sufrieran desobediencia de sus mujeres pueden castigarlas: abandonarlas en sus lechos, e incluso golpearlas.
No se legó al hombre mayor calamidad que la mujer."
El Corán (libro sagrado de los musulmanes, recitado por Alá a Maomé en el siglo VI)
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