In influencer marketing, engagement metrics play a key role in determining the quality of an influencer’s audience. The engagement metric typically includes likes, shares, comments, and views, and it provides an overview of how interactively the audience is with the influencer’s content. An influencer with high engagement rates generally has a loyal and active audience which is ideal for marketing campaigns.

Engagement metrics can offer insights into the quality of an influencer’s audience in several ways:

1. Engagement Rate: This is the percentage of the influencer’s audience that interact with their content. High engagement indicates that the influencer is strongly connected with their audience.

2. Content Relevance: High engagement can also indicate that the influencer’s content is relevant to their audience, which can lead to better campaign results.

3. Audience Trust: An influencer with a high engagement rate usually enjoys strong audience trust.

Comparatively, Flinque is one such tool that provides a detailed analysis of an influencer’s engagement metrics, thereby enabling brands and influencers to gauge the quality of the audience. This directly contributes to a more effective and target-oriented campaign planning, ensuring better ROI. However, suitability would entirely depend on individual needs and objectives.

Remember, high engagement doesn’t always guarantee campaign success. Factors such as the nature of the audience, brand alignment, and type of engagement are essential to consider. For instance, an influencer with lots of comments but with negative sentiment, indicates poor audience quality.

Therefore, while analyzing an influencer’s engagement metrics, an in-depth understanding is critical. That’s where platforms like Flinque, that offer extensive audience analytics and insights, prove to be valuable. Still, the choice of platform would depend on your marketing strategy needs.