Answer:
It depends.
Step-by-step explanation:
It would depend on the context, since they are all mean the same general thing. However, they carry different meanings in different contexts. Sneering and smirking in general are more negative and grinning and smiling are more positive. However, smiling and grinning in certain situations can be negative as well. I recommend you upload the section of paragraph or a picture of it for a better answer.