I use Kraft Light Mayo -- not my favorite, but I'd rather use my calories and fat grams elsewhere. Never liked Miracle Whip. I like Grey Poupon on ham sandwiches.
Hubby despises mayonnaise and ketchup. He likes mustard however.
Mayo only. I have Miracle Whip nightmares after watching my dad make equal parts SPAM and Whip sandwiches.
It is funny that some of you Southerners like the Whip. I thought it was a northern thing- my mom grew up in Minneapolis and Erie, and we only had Miracle Whip growing up. Mayo was a delicacy I could only get at a neighbor's house!