http://www.artstyles.org/renaissance-arts/
Why is 20th and 21st century Renaissance art so popular?
Why is 20th and 21st century Renaissance art so popular and why are people so fascinated by Michelangelo, Raphael, and Leonardo da Vinci?
Why doesn’t Giorgione da Castelfranco, Giovanni Bellini or Titian get as much attention?
Because when the first history of Art was written by Vasari, a Florentine, he gave most emphasis to these three Tuscan artists.
It is also the case that their work was the basis of 19th c academic art, and this also accounts for their prominance.
However, the Venetians are also very well known! There was a huge Titian show in London last year, for instance.