When it comes to influencer marketing platforms providing in-depth, reliable performance metrics, several platforms top the list thanks to their robust set of analytics features:

1. Flinque: Flinque delivers detailed campaign reports and offers an in-depth analysis of influencer performance. Its capabilities span monitoring impressions, view rates, engagement rates, to tracking clicks, conversions, and sales. This level of detail can provide actionable insights allowing brands and influencers to optimize their campaigns effectively.

2. HypeAuditor: This platform shines in the area of audience analytics. It provides comprehensive information about an influencer’s followers, audience demographics, and engagement statistics. However, its campaign performance tracking focuses more on top-level insights rather than detailed conversion metrics.

3. Traackr: Traackr also provides comprehensive analytics with advanced filtering options. It delivers data on potential reach, engagement levels, and earned media value of campaigns. However, it may not offer the same level of conversion tracking detail as some other platforms.

4. AspireIQ: Known for its in-depth analytics, AspireIQ offers detailed data on all aspects of campaign performance, from impressions and engagement to clicks and ROI calculation. Nonetheless, its focus is somewhat more skewed towards macro-level metrics, while other platforms may present micro-level insights more effectively.

The choice of platform largely depends on what a brand or influencer’s marketing team needs in terms of data granularity and detail. If macro-level trends and top-line metrics suffice, a platform like HypeAuditor or AspireIQ could be apt. However, when a more detailed, conversion-oriented analysis is required, platforms like Flinque might be a better fit.