1. Integrations: InVision offers extensive integrations with popular tools like Sketch, Adobe XD, and Slack, making it a preferred choice for designers who want seamless workflows. On the other hand, Marvel also provides integrations but with a limited selection compared to InVision.

2. Collaboration Features: InVision stands out for its advanced collaboration features such as real-time commenting, version control, and user testing capabilities, while Marvel offers basic collaboration tools but lacks the depth and sophistication found in InVision's platform.

3. Prototyping Capabilities: InVision allows for high-fidelity prototyping with advanced animations, transitions, and interactions, giving designers more flexibility in creating interactive prototypes. Marvel, while offering prototyping functionality, may have limitations in terms of complexity and customization compared to InVision.

4. Project Management: InVision provides robust project management features such as timelines, boards, and workflows, making it a comprehensive platform for managing design projects from start to finish. Marvel, while offering project management tools, may not have the same level of depth and customization options as InVision.

5. User Experience Design: InVision focuses heavily on user experience design, offering UX tools like user testing, personas, and journey mapping to help designers create more user-centric products. Marvel also supports UX design but may lack certain advanced features and resources found in InVision.

6. Price and Plans: InVision offers a range of pricing plans to cater to different needs, including a free plan with limited features, while Marvel also provides various pricing options but may have fewer features in its free tier compared to InVision.

In Summary, the key differences between InVision and Marvel lie in integrations, collaboration features, prototyping capabilities, project management tools, focus on user experience design, and pricing plans.