1. Cost: GitHub Pages is free to use with unlimited hosting for static websites, while Weebly offers a free plan with limitations and requires a paid subscription for additional features such as a custom domain.

2. Customizability: GitHub Personal Website Generator allows for more control over the design and functionality of the website through coding and customization, whereas Weebly provides a drag-and-drop builder with pre-designed templates limiting the level of customization.

3. Version control: GitHub provides version control through Git, allowing users to track changes, collaborate with others, and revert to previous versions easily, which is not available in Weebly.

4. Community and Collaboration: GitHub fosters a community of developers allowing for collaboration, feedback, and networking opportunities, while Weebly lacks a centralized community for users to engage with one another.

5. Learning curve: GitHub Personal Website Generator requires some knowledge of coding and familiarity with Git, making it more suitable for users with technical skills, whereas Weebly is user-friendly and does not require any coding experience.

6. Flexibility: GitHub allows users to host both static and dynamic websites with various features and extensions due to its open-source nature, while Weebly is more focused on static websites and has limitations in terms of dynamic content integration.

In Summary, GitHub Personal Website Generator and Weebly differ in cost, customizability, version control, community collaboration, learning curve, and flexibility.