What is the difference between Webtop and D2?

Could you please elaborate on the distinction between Webtop and D2? I'm curious to understand the key differences in terms of functionality, user experience, and potential applications. Are there any specific industries or use cases where one might be more suitable than the other? Additionally, how do they compare in terms of security, scalability, and overall performance? I'm looking for a comprehensive overview to help me make an informed decision on which platform to use for my next project.