Whether there is a difference between the center and side stand depends on whether, and how much, the suspension compresses on the side stand. I think my rear suspension is barely, if at all compressed on the side stand, so there wouldn't be much difference between the two. I adjusted mine today and on the center stand and it was about 1.25", but upright on both wheels (no rider) there was maybe 1/2" or less, so I readjusted to 1.5" on the center stand and was much more comfortable with the slack with the suspension slightly compressed.
2014 V-Strom 1000 - Desert Khaki
2011 Burgman 400
2007 Honda Helix
2013 V-Strom 650 - sold