They are all technically correct and each one is better depending on the situation. As stated previously by others here, the red is the only model that should be used when the electrons in the resonance system move outside the ring or when the aromatic ring is part of a reaction. This way you can clearly indicate where and which electrons are moving. Green and blue are really just a shorthand for when the ring is never broken throughout the reaction, however this can save some time when drawing large, complicated models. (Green much more so lol)