Response B is better because it follows the prompt instructions and provides slightly more clear, correct, and complete information about the BIOS memory-training message. Response A is also accurate and helpful, but B gives more practical explanation about the restart options and what repeated prompts could mean.

Response B provides superior value by adhering to the given instructions while delivering information that is more precise, accurate, and thorough regarding the BIOS memory-training notification. While Response A offers useful and correct details, Response B excels in offering clearer practical guidance about restart choices and explaining the significance of recurring prompts.