It is always difficult to address this type of question, while imparting useful information that the average client will understand. On the one hand, all modalities are perfectly capable of treating any hair successfully. On the other hand, the processes are different, and the learning curve for them is also different, and individual practitioners tend to favor one over others, so what your practitioner is best at delivering is not the same as someone else, and so, what the best modality to use becomes very dependent on the person holding the probe, and sometimes, the machine the person is using. For instance, While some problem hairs are more easily treated in blend, the syncro version of thermolysis/flash on the Apilus Platinum makes it easy to do that same hair without switching to blend, and thus saving precious seconds per hair over the average blend performing electrolysis provider’s treatment time.