Michael Jackson, unquestionably, has a bigger, more global impact on pop culture than Elvis did.
Not surprising considering Michael Jackson sold more records including in markets Elvis didn't from North America, South America, Europe, Asia and Africa. The fact his tours are still amongst the biggest ever is testament to his popularity.
The Moonwalk, glove, hat and socks as well as toe stand is as famous as Coca-Cola. African tribes were even pictured mourning his death wearing his hat and glove - they knew Jackson, but not Elvis.
When he died in 2009, Google crashed because it thought it was under attack by the huge numbers of people searching his name. Approximately 1 billion people around the world tuned in to watch his public memorial service.
His influence is still seen in the modern music industry today and you still see him set as the standard to strive towards which we see when anyone comes close or equals it.
You don't become as massive as Michael Jackson without being the best seller. Bowie, Mercury and so on don't come close to Michael's impact on popular culture.
Thriller is still part of Halloween to this day.