What is the best white-label crypto exchange software?

In the realm of cryptocurrency and finance, the quest for the optimal white-label crypto exchange software is paramount. Could you elaborate on the criteria that define such a software? Are there specific features that set it apart from the rest? For instance, does it offer robust security measures, user-friendly interfaces, and scalable architectures? Moreover, how does it handle regulatory compliance and liquidity management? Also, are there any notable testimonials or case studies that highlight its success in the industry? As a professional in this field, I'm curious to know what makes a white-label crypto exchange software stand out as the best in today's competitive market.