To add to what OME said, layer height alone is not the sole determining factor in print quality. It's not even the biggest factor. Speeds, temps, material, and machine all play a HUGE role in final output. based on your comment of standard to high quality I'm going to hazard a guess that the layer heights are .2 and .1mm respectively. Not all machines can print .1mm with any level of success. I know my ffcp definitely prefers .2 to .1 based on my current settings but I haven't bothered to work towards .1 anyway because .2 is plenty good for the stuff I print.