I only need to have accuracy down to Half a Thou. .0005

Doing some math - It looks like if I setup 1/2 microstepping with my particular setup - That will exactly equal this goal.

So my question is - should I choose 1/2 mcrostepping, or is there some engineering juju that I do not know about using higher microstepping rates, that would be a better choice? i.e. - what microstepping rate do you think I should choose for my setup? (and please explain why you recommend that - I am hoping to learn something).

The math I used: