But it can’t be the thing that mattered first and foremost because then a 20c bullet would win against any drone. But a bullet is not great at intercepting small moving targets. Which is why I asked how good are they at intercepting at those speeds especially FPV mode.

The thing is, for a guided interceptor, the speed ratio between the interceptor and it's target has an extremely strong effect on how difficult the intercept is. In practical situations increasing speed is the best way to increase intercept chance.