One of the questions often asked in respect of the Classical Guitar is do you need to read music or can you learn from Classical Guitar Tablature? The answer is that it is better to take lessons and learn to read music. The Classical Guitar Tabulature only shows the fingering for the left hand, whilst the music which is written all in the treble clef gives the timing for each note, and it is also conventional that the music for classical guitar be annotated with the right hand fingering, and often the left hand fret position too.
It is personal preference as it is quite possible for highly talented individuals to play entirely by ear, using their sense of tone, timing and rhythm to pick up the correct notes and sequences to play. However as a general rule I would recommend learning to read music, because those who master sight reading are able to play anything from the original scores. The trained musician who masters Classical Guitar and who can sight read will always be in demand, that is not to say that tabulature does not have a place in learning to play the Classical Guitar it certainly does and many quality players use tabs to help them learn new pieces.