Henin easily between these two. Henin made Clijsters her b!tch on repeated occasions in slams, this has to play a large factor in who's greater between the two. Not to mention that Henin has won 3 of the 4 slams and 7 slams total, while Clijsters only has 2 slams total, both USO titles. Add to that Henin's dominance in 2007 over a formidable women's field, and it's no contest really, Henin on all cards.
I dont agree the 2007 field was formidable. Past their prime Williams sisters, Sharapova, and nobody else. People say the womens field is terrible, maybe the worst ever now, and yet the only real difference from 2007 is Henin not being there. So if the field is as bad as everyone says it is now how could it have been formidable in 2007, did Henin alone make that much of a difference or are there other differences between the two I am missing here.
Clijsters was very unlucky to miss a whole year with injury from the 2004 French to 2005 Australian Open. Her nemisis Henin won 0 slams during this period due to health problems. Serena Williams was also out of form and won 1 slam at the 2005 Australian Open in ugly fashion. Venus was a complete non entity almost during this time. Inferior players who Clijsters completely owned like Kuznetsova, Myskina, and a 17 year old Sharapova (who Kim owned until late 2006) all won slams. While the field had more depth then than it does now, this was also possibly the softest collective year of slam winners in history. So Kim could have easily won 2, 3, or 4 more slams in this year frame had she not had the worst timing to be injured during this year of tennis which would have been hers to potentialy dominate given all that happened during it, and had 4-6 even with what she missed possibly by being retired for nearly 3 years.
Henin also utilized cheating to defeat Clijsters in the 2004 Australian Open final. At a crucial point at 3-4, ad Henin with Clijsters serving she hit a swing volley winner which hit the back of the line and Clijsters put on an Oscar worthy performance in pretending the ball was clearly out. The chair umpire took the bait and overruled it and when the video screen played in the arena showed it was in Henin actually smirked as the crowd was still whisting over the call and especialy the impending evidence. Henin was actually the one choking this match away, blowing a 4-2 2nd set lead and a 4-0 3rd set lead. She used some famous Henin trickery to get the crucial break and put the momentum back in her favor.
Kim's problem is she is too nice a girl. She isnt hungry enough to win. I dont neccessarily agree that she is less talented than Henin whose talent level is overrated by some IMO. Henin is simply a whole lot hungrier. To her winning slams and staking her place in history as one of the greatest players ever is life or death. To Clijsters it is not, she likes to win, but it isnt the be all and end all. Kim doesnt have the hunger and will to win that Henin, Venus, Serena, and Sharapova all have. What she has won she wins on ability alone, since mental strength is never what puts her over the top.