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It's not really about who's better. They both have entirely different styles in painting. Da Vinci was a very literal painter-- very realistic. He was an early Renaissance artist and his paintings were all very classic and realistic. Picasso was a cubist painter-- very abstract. There was a time before he was a cubist where he painted more literal than his cubism paintings, but it still wasn't close to how literal Da Vinci's art was. I wouldn't say who is better-- art doesn't really work like that. They both have different techniques and ways of interpreting their feelings through the art. They were both very detailed and talented, and also very influential. Picasso's abstract art was much different from Da Vinci's mechanical, almost symmetrical, drawings. Different doesn't mean who is better than who. They both made sculptures in their lifetimes, and I think Picasso was much more successful (money wise) during his lifetime. So I wouldn't necessarily say that one is better than the other. They are both amazing artists in different ways. I hope this helped somewhat. :) (I personally like Picasso better. His painting reflect so much expression-- so much meaning. He was very good at translating his feelings and emotions into art, and I think that that is what makes a true artist.)
Personally I like Da Vinci.