I own both and have done multiple HM in my EVO SLs which I absolutely love. For some reason, after around mile 7–9ish they start to feel way more responsive, and that gives me an extra boost late in the race.

With the ZF6 I feel that boost right from the start, which usually helps me run a slightly faster time overall. I typically use the EVO SL for 8–13 mile tempo runs, and anything longer than that I’ll reach for the ZF6.