In standard Ostim animations male have something like 1.03 and female 1.0, i think. Females are a little shorter. I like this configuration. It's important a standard configuration of animations because it makes everything work together. If you reduce or increase the size too much, other animations even out of sex will be fucked up and clipped. Or when you end the animation, characters will change too much their heights to return their standard sizes.
In sexlab it scales both actors to the same height during animations. At least here the alignment doesn't work well if i disable the scale, so "petite" animations also don't work here, because they scale to the same height. So i don't use them for SL.
In Ostim i think the Size Difference animations are interesting for goblin followers, but i need to replace the custom skeleton with a standard one, if they have a custom one, and edit the goblin height to match the change of SD animations. Otherwise, they change too much their size, which is dumb during gameplay.