We can't say for certain if 1/32 is better than 1/16 microstepping, there's a lot that goes into it. It's also true like stated before, increasing microstepping can make the true positional accuracy worse (the stepper is in a different position than the controller thinks), but it makes the movement that does occur smoother and often quieter. That's as long as all the other stuff like controller/component speed limitations, harmonics,etc don't get in the way first. The difference between 16 and 32 is at the point that the increased microsteps is easily (although not always) overshadowed by other factors in a build. Harmonics are especially bad about causing it to be good or bad difference in a particular build, the damn frequency changes significantly with how tight you have your belt/line on top of all the other parts of the build that affect it. Still, the positions after half step are imaginary,(I suppose half step could be considered imaginary too) just like the positions between the smallest marks on a ruler. You're accuracy would be iffy too if you start trying to say which 1/32 between between 1 mm and 2mm a line was at.
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