While Molly did have two title reigns totaling about 10 months in one of the stronger Divas divisions that the WWE has had in the 2000s, she has done very little outside of those runs, including a limited non-WWE career and a generally pathetic overall win/loss record in total over her WWE run(only receiving strong booking from spring of '02 through the end of '03).
Hamada on the other hand is one of the most decorated women in all of Japan and Mexico post-2000, is arguably one of the greatest tag specialists in the history of women's wrestling, and has defeated a pretty impressive list of performers.
And just to avoid her being lumped in as another competitor in this tourney who didn't get a chance to show herself on the National TV stage, it should be noted that she was also booked relatively strongly in TNA despite not having won the KOs title, owning a above .500 record with wins against the likes of Daffney, Sarita, Taylor Wilde, and Madison Rayne; and two runs as KOs tag champ with two different partners, never being defeated for those belts on either occasion.
Hamada is the stronger worker with the more complete body of work, her career easily trumps one strong 18-month run that represents all of Molly's toutable success.