The same is surrender. Why is Guan Yu praised and Yu Ban reviled?

Because their motives are different. Everyone knows that Guan Yu is a very loyal person, and it stands to reason that he will never surrender anyway. In fact, Guan Yu surrendered not for his own life, let alone for promotion and wealth. Guan Yu surrendered first to protect Liu Bei's wife, and then to save himself and continue to work for Liu Bei.

In order to do this, Guan Yu and Cao Cao made three chapters. Something like this. First, surrender to the Han Dynasty, not to Cao Cao. Second, ensure the safety of Liu Bei's wife. Third, you can leave at any time to find Liu Bei. If Cao Cao doesn't promise Guan Yu, he won't surrender anyway. It can be seen that Guan Yu is really in Cao Cao and his heart is in Han.

But Yu Jin is different. Yujin surrendered just to save his life. With him was Pound, known as General White Horse. Yu Jin followed Cao Cao much longer than Pound, so Yu Jin should be more loyal than Pound. But this is not the case. Pang Daning would rather die than betray Cao. Through Pound's foil, the unbearable ban is even more prominent.

Therefore, although Guan Yu and Yu Jin were defeated and surrendered, the evaluation of future generations was quite different.