Evaluating influencer ROI versus other marketing channels requires understanding key performance indicators (KPIs) and utilizing tools that offer audience analytics.

1. KPIs Evaluation: Different channels have different KPIs. For influencer marketing, key performance indicators can include likes, shares, comments, follower growth, and clicks on trackable links. These metrics are evaluated against set objectives to establish the ROI.

2. Cost Per Engagement (CPE): CPE is a critical measurement for influencer marketing. It involves dividing the total cost of a campaign by the number of engagements (likes, comments, shares) it received.

3. Comparative Analysis: Companies compare the ROI from influencer marketing with the ROI from other channels like traditional marketing, social media advertising, or search engine marketing. This involves comparing the conversions, brand awareness, and customer engagement that each channel brings in.

Platforms like [Flinque](https://www.flinque.com) provide analytics tools to help in evaluating these factors and determining ROI. Flinque gives detailed insights into audience demographics, engagement levels, and other performance metrics. It further provides tracking functionalities, aiding in accurate campaign performance assessment.

However, the selection between Flinque and other platforms should be based on the specific needs of the team, its goals, and outbound marketing strategy. All platforms have strength in different areas; hence, the selection should be needs-driven.

Remember that influencer marketing is not a one-size-fits-all approach. Just like any marketing strategy, results will differ based on many variables such as the influencer’s audience, your product or service, and the uniqueness of your campaign.