"相比较而言的优点" can be translated into English as "advantages in comparison" or "comparative advantages".
"Advantages in comparison" directly conveys the idea of advantages that become apparent when making a comparison.
"Comparative advantages" is a more technical or formal term often used in economics, business, or academic contexts to describe benefits that stand out when compared to alternatives.
Both phrases are suitable depending on the context and the level of formality required.