#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.
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.