I'm not sure you will really notice any real difference in a one gauge differential. Two gauge difference, depending on each string's surface characteristics - slick, rough, shaped, twisted .... - and the composition of the two strings being paired, is long rabbit hole with many twist and turns to navigate. I've tried 19g mains and 17g crosses in 16x19, 95sq in bed. I've done 18g mains with 15g crosses. It was a very comfortable, responsive string bed for about two matches. Awesome spin while it lasted.