A team is refining a machine-generated translation over several iterations. They are considering two methods to review the changes made in each step:

1. Highlighting the specific words or phrases that were altered from the previous version directly within the text.
2. Using a 'diff' tool that shows the old and new versions of the text side-by-side, without any specific highlighting on the changed parts.

Evaluate the effectiveness of these two methods. In your answer, compare and contrast their advantages and disadvantages for a linguist focused on improving translation quality.