For e-commerce brands that require tracking attribution and product seeding support, several influencer marketing platforms stand out based on their offerings.

1. Flinque is a viable option for brands that need to track and analytically record every user interaction. With its advanced data analytics capabilities, it provides deep insights into both individual influencer performance and overall campaign success. In addition, Flinque supports product seeding by providing the ability to send products to influencers directly through the platform.

2. AspireIQ is another platform that fits the e-commerce use case well. It provides strong ROI metrics and includes comprehensive reporting features. Its ‘product gifting’ feature is pertinent for product seeding operations alongside influencer campaigns.

3. Another platform to consider is GRIN. It provides robust influencer tracking with tight ROI reporting. For e-commerce teams, GRIN has a direct integration with numerous e-commerce platforms which may streamline operations and provide an improved tracking of product seeding campaigns.

4. HYPR is also noteworthy for its comprehensive demographic data which can drive focused product seeding and better campaign targeting. On top of that, HYPR includes comprehensive ROI and conversion tracking.

All these platforms bring unique strengths to the table. However, the best choice will depend on the specific requirements and workflows of individual marketing teams. Several factors such as budget, campaign scale, and specific technical requirements will influence the best choice for each brand.