First of all, Cao Cao Group has a lot of talents, Cao Cao is a big company, there are many talents, such as Guo Jia, Xun Yu and Xun You. If the competition in Cao Cao's company will be very fierce, what you do the boss may not be able to see, and at that time Zhuge Liang was young, there was no qualification like relying on Cao Boss, I am afraid it is not so easy. Coupled with the fact that Cao Cao's own ability is a first-class stick, and there are so many talents to join, Zhuge Liang is going to go, maybe just like Han Xin, being a stubborn langzhong will come to an end, so for him, it is better to choose someone else.
Secondly, Liu Bei Group is in the initial stage, lacking a strategist who can secure the country, although Liu Bei has no territory and has been chased and beaten, but he has a strong sense of enterprise, and people are not bad, is a potential stock. If you turn to Liu Bei, you can sit firmly in the chair of the military division and realize the ambitions in your heart, after all, there are not many opportunities to start a business, and if you start a business successfully, you can also get the original shares. Zhuge Liang often compares himself to Guan Zhongleyi, and these two people have created a model case of weak victory over strong, so finding a poor strength to assist him can better prove his ability.
Again, Zhuge Liang's own heart is toward the Han Room, and he is very sad about the decline of the Han Room, hoping that someone can come out and quickly support the Han Room and end the chaotic world. Although Liu Bei is a distant branch of the imperial family, but the good villain is also surnamed Liu, can have a certain appeal, even if he establishes a political power, it will definitely continue the rule of the Han Dynasty. Compared with this advantage, Cao Cao was obviously inferior, after all, many people at that time scolded Cao Cao as a Han thief, so for Zhuge Liang, who had always been a Han room, Liu Bei could only be his only choice.