The most accurate way to compare skaters from different eras is to judge how impressive was Kristi's technical content in 1992 versus how impressive was Yu N Kim's technical content in 2010. Although I do indeed lurve Yu Na Kim, her LP content was not as impressive in 2010 as Kristi's LP content was in 1992. And Kristi's line was definitely superior.
--The SP really can't be compared at all: In 1992, women weren't even allowed to do more than 1 triple in the short. So you really can't compare what Yu Na did in her Olympic short when Kristi wouldn't have even been allowed to do that content in 1992. That would be like comparing a current male who did a quad in his SP to a male OGM from an era when quads weren't allowed in the men's short.