There is not a single best footstrike form for all people and all types of running. What is best for you depends on whether you run sprints versus marathons, what your natural footstrike pattern is, and what type of footwear you use. There is little scientific evidence to support switching from your natural footstrike form, so the best footstrike for you is likely the one that comes most naturally to you. Of course, there can be injuries or extenuating factors, so speak with a healthcare professional or running coach if you have concerns about your natural running form.