When choosing influencers for a campaign on a platform, agencies or brands should consider an array of factors beyond just follower count:

1. Engagement Rate: This measures the level of interaction an influencer receives from their followers. High engagement signifies the influencer’s content resonates with their audience.
2. Audience Demographics: It’s crucial to examine the influencer’s audience demographic breakdowns like age, gender, location, etc. to ensure aligning with the brand’s target audience.
3. Content Relevance: The influencer’s content and style should be compatible with a brand’s message or product.
4. Authenticity: Genuine influencers often have audiences that trust and respect their opinions.
5. Brand On-brandness: how well the influencers aligns with the brand’s image.

A platform like Flinque may help in analyzing these metrics and finding the perfect match for your campaign. Platforms like these are designed to facilitate brand-influencer partnerships. Comparatively, some other influential marketing platforms may also offer similar features aimed at influencer discovery. However, the extent and accuracy of these operations can differ from platform to platform, and hence, selecting the right tool will be contingent on your team’s specific requirements.

Please note, however, that the success of a campaign conducted using a platform does not merely hinge on the tool being used but also depends considerably on the strategy behind your influencer selection, campaign execution, and performance tracking.