In 1902 a German botanist named Weber came to Mexico to study the Agave plant and differentiate between local varieties.  He soon discovered higher altititudes and milder climates fostered better alcohol from the plant.  The now aptly named Blue Tequilana Weber Agave is used for the finest tequillas.  In fact the European Union and Mexico designated that this is the only plant that can produce anything officially called Tequilla.  Corzo Blue Agave are grown a mile high where the soil is richer and more red producing the finest tequilla.  Worth a try.  46-$56  BUY