Gecko 210 VS 201 difference?

I have been looking into both the drivers and can any one tell me the
pratical advantages of 210 over 201 when using it for a CNC
application. 210 has options for full step, half step, 5uSetp and
10uStep, where as 201 has only 10uStep per step option. If I were to
use only 10uStep per step then there will be no advantage of 210 over
201. So where will one use 5uS or half step?

Thanks
Kim