Although both Lu Su and Zhuge Liang advocate "three points first, then reunification", there are differences between them. Lu Su's three points are: Sun Quan, Cao Cao and Liu Biao; Zhuge Liang's three points are: Sun Quan, Cao Cao and Liu Bei. In fact, in terms of geography, Lu Su and Zhuge Liang have exactly the same idea. They all divide the world into Jiangdong, Zhongyuan and Jingzhou, but Zhuge Liang changed the owner of Jingzhou from Liu Biao to Liu Bei. This is also in line with their respective historical conditions and easy to understand, because when Lu Su put forward the "three points", Liu Biao was sitting in Jingzhou, while Liu Bei was still a nobody. Zhuge Liang is assisting Liu Bei, so it is natural to take Liu Bei into account. From this perspective alone, the historical facts behind it prove that Zhuge Liang is more far-sighted.
The biggest difference between Lu Su and Zhuge Liang's "Longzhong Dui" is that Lu Su is superior to others except for the three-point theme. We know that Zhuge Liang's ultimate goal is "the Han Dynasty can prosper", but Lu Su has long seen that "the Han Dynasty cannot be revived". Zhuge Liang assisted Liu Bei with the slogan "Reviving the Han Dynasty". On the one hand, this slogan won the hearts of Liu Bei Group and the so-called "legitimacy", but it also became the heaviest political burden of Shu Han and even Zhuge Liang himself.
The third difference lies in the steps of unification. Lu Su's plan is to destroy Liu Biao first, then take Yizhou, then rule the great river with Cao Cao, and finally unify China, that is, to turn the Three Kingdoms into "Northern and Southern Dynasties" first. Zhuge Liang's plan is to take Jingzhou first, then Yizhou, occupy the west, and then wait for an opportunity to move north and east to complete reunification, that is, to turn the Three Kingdoms into "East and West Han" first. However, both Lu Su and Zhuge Liang overestimated themselves and underestimated their opponents. In historical reality, they are the last to be eliminated.