Where is the most standard Minnan language?

Taking Quanzhou dialect in Minnan dialect as the standard, her accent system will be relatively pure, and her pronunciation is also different from Zhangzhou dialect. Xiamen dialect is between Quanzhou dialect and Zhangzhou dialect. If Xiamen accent is taken as the benchmark, it will not be very beneficial to Zhangzhou dialect or Quanzhou dialect. If Zhangzhou dialect and Quanzhou dialect are well protected, it is equivalent to protecting the mixed Xiamen dialect. If Xiamen dialect is taken as the standard, Zhangzhou dialect and Quanzhou dialect will become more chaotic in the future, and this clear boundary will become blurred. So we don't approve of mixing Xiamen dialect, but choose Quanzhou dialect with a long history as the standard, or Zhangzhou dialect and Quanzhou dialect develop separately.