Should I say “difference between” or “differences between”?

Both can be correct.

Use “difference” when talking about one main point.

Use “differences” when talking about multiple points.

Examples:

• The main difference between the two phones is the camera.

• There are many differences between British and American English.

In everyday English, people often use “the difference between” even when the answer includes several details, but “differences between” is more precise when there are multiple distinctions.