佔他的便宜, 拿他的好處

[meatie]

How are "拿他的好處" and "佔他的便宜" different?

[Divato]

I think the difference is the latter one 他 intentionally give the benefit to exchange another benefit. You take the benefit and you have to work for him or return him a favor. It's like guanxi, 拿了他的好处就要为他办事.
On the contrary, 佔他的便宜, 他 only get loss. And the one who 佔他的便宜 may or may not use some tricks to deceive him. But the tricks could be legal and the loss may not be so great. Otherwise, it would be 诈骗 defraud. Besides, 佔便宜 has another meaning, 佔女孩便宜, for example, you use the opportunity when a train or any public transportation is crowded, you intentionally touch a girl but use the crowd as an excuse.

[aone]

拿他的好处 bribed by someone

佔他的便宜  take the advantage of someone