Personally, Nancy Reagan appears more real than Mrs. Kennedy who appeared clearly scripted ala Hollywood.
Ouch - I was afraid somebody was going to say this. And its an apples-and-oranges comparison. Mrs. Reagan essentially had 10 years to prepare for these last few days, while Mrs. Kennedy had only one brief red flash in a motorcade to do the same.
Personally, I would cut Mrs. Kennedy some slack vis a vis these types of comparisons as a result. Just my opinion.