1. User Interaction Recording: FullStory provides a session replay feature that captures every user interaction on the website, allowing for detailed analysis of user behavior. Smartlook also offers a similar feature, but with fewer customization options and filtering capabilities.

2. Integration Options: FullStory offers seamless integration with various third-party tools and platforms like Google Analytics and Slack, making it easier for users to unify their data. On the other hand, Smartlook may have limited integration options compared to FullStory.

3. Data Storage and Privacy Compliance: FullStory is compliant with various data privacy regulations like GDPR and offers robust data storage capabilities, providing users with more control over their data. Smartlook also complies with GDPR but may have limitations in terms of data storage and privacy features.

4. Advanced Filtering and Segmentation: FullStory offers advanced filtering and segmentation tools, allowing users to pinpoint specific user sessions based on various criteria. Smartlook, while offering basic filtering options, may not have the same level of granularity and customization.

5. Real-time Monitoring: FullStory provides real-time monitoring of user sessions, enabling users to track live interactions and make immediate optimizations. In comparison, Smartlook may have a slight delay in displaying real-time data, impacting the immediacy of insights for users.

6. Price and Plans: FullStory typically offers pricier plans compared to Smartlook, making it more suitable for larger enterprises with a bigger budget. Smartlook, on the other hand, may have more affordable pricing options for smaller businesses or startups.

In Summary, FullStory and Smartlook differ in user interaction recording capabilities, integration options, data storage and privacy compliance, filtering and segmentation tools, real-time monitoring features, and pricing plans.