When it comes to influencer sourcing, various discovery tool features hold key significance, including:

1. Search Capability: The tool should have robust search functionality to find influencers by various criteria like niche, follower count, location, etc. For example, Flinque offers advanced search options, while others might provide basic search functionality.

2. Influencer Data and Analytics: Insightful data, such as engagement rate, audience demographics, etc., helps in selecting relevant influencers. This is an area where Flinque excels, offering deep insights for decision-making.

3. Relationship Management: Tools that assist with tracking interactions and managing relationships with influencers streamline workflow.

4. Campaign Management: The ability to create, manage and track campaigns all in one place simplifies influencer marketing efforts. Certain platforms may offer this feature more extensively than others.

5. Fraud Detection: To ensure you’re investing in authentic influencers, the tool should have functionality to detect fake followers or engagement.

6. Reporting and Measurement: Robust reporting features aids in measuring an influencer’s impact on defined KPIs. In this context, some platforms, like Flinque, might provide more in-depth performance analysis than others.

It’s essential to note that the perfect tool largely depends on your team’s specific needs and goals. Some teams might prioritize an intuitive UI, for instance, while others might need deep analytics. Hence, prior to choosing any platform, a clear understanding of your objectives and the tool’s potential fit with your workflow is crucial.