I don’t want to judge which of the guitars made by those many really good guitar makers is the best. Of course, people tend to prefer the well-known brands. However, I have also seen very bad ”pistolitas” made by world-famous guitarreros and discovered a fantastic “cañon,” when visiting an unknown guitar maker who still builds his instruments with loving care and outstanding craftsmanship somewhere in the Sierra Morena..
An important aspect is the region where the guitar comes from and which climate it is ”torn away” from. There is an old saying, ”La guitarra de Granada suena (sounds) en Granada, la guitarra de Sevilla suena en Sevilla.” A guitar from Málaga, a town on the coast, won’t survive the first winter without cracks in the wood in a normally (for us) heated room, where air humidity often drops below 40 per cent. The same conditions wouldn’t harm a guitar from Madrid because it is very dry there. You will have problems with the sound of this guitar if the air is too humid, though. Fortunately, these problems only appear in the first years. The number seven plays an important part here, because after seven years the guitar has become fairly acclimatized.
Naturally, this isn’t true for guitars from Madrid, which are built in air-conditioned workshops. It is relatively easy nowadays to create a humidity which is all right for people, but to create the contrary, i.e. to keep the air constantly dry, is much more difficult.
Source: Flamenco Guitar Method Graf-Martinez