OpenSpec vs SpecKit?

[TomLucidor]

recently this video of "Gray Cat" popped up, and I wonder if switching would be better for BMAD. They tested it to 10x going from Speckit to OpenSpec (but still sided with the project with strongest company backing) https://www.youtube.com/watch?v=sGYvGUkerA0
OpenSpec seems to put feedback loops front and center, while GitHub speckit is iterative yet something feels different. Constitution vs proposal as two different modes of "spec based development", reliability (incremental more than iterative) vs velocity (agile even for brownfield). https://github.com/Fission-AI/OpenSpec/?tab=readme-ov-file#how-it-works