#5 Women Champions: 4 (Hardcore title) vs 6 (24x7 title)

As far as diversity is concerned, the 24x7 title ranks higher than the Hardcore title. While having non-wrestlers getting runs with the title hasn't gone down well with wrestling fans, the 24x7 title has seen more female wrestlers win the belt in its one-year history than the entirety of the Hardcore title's four-year run.
Only four women have won the Hardcore title in the WWE and all of those reigns lasted less than a day. The first woman to win the title was Cynthia Lynch - an obscure wrestler who had a blink-and-miss run in the company as part of Godfather's entourage. Additionally, Molly Holly, Terri, and Trish Stratus also won the title in the company for short reigns.
R-Truth wanted to 'kill' former WWE writer. More details HERE
As for the 24x7 title, at least two women were involved in storylines when they won the belt. Carmella - the only woman to win either of the titles more than once - had a long-running angle as R-Truth's sidekick, a run that resulted in two title reigns for a combined duration of 11 days. Maria Kanellis won the title from her husband Mike during her pregnancy storyline and held the belt for a week.
Other than the duo, Tamina is the only main roster female talent to have won the title, having done so in a short segment at Hell in a Cell last year. Alundra Blayze, Kelly Kelly, and Candice Michelle have all had cameos winning the belt as well.