Well, of the ones I listed, their longevity is about equal (12 years for Rose to 12 years for Weili to 10 for Joanna - though Rose has another 3 years of amateur experience and Joanna has another 6 years of kickboxing/Muay Thai experience). I give the strength of schedule edge to Joanna and Weili because, being champions, they had more fights against top contenders (plus, as someone else pointed out, they had more success than Rose against common opponents). For win/loss ratio, you're looking at 14-7 (Rose) to 26-3 (Weili) to 16-5 (Joanna). For finish rate, it's 50% to 73% to 31% - Rose beats Joanna there but falls well short of Weili. For title defenses, it's Rose 2, Weili 4, Joanna 5.
Of the categories I listed above, Rose is the best at only one of them - longevity - and even that's tied with Weili. She's last everywhere else except finish rate. Weili is top in longevity (tied), W/L ratio, and finish rate. She's second only in title defenses, and last nowhere. Joanna is behind Weili in most categories but still beats Rose in strength of schedule, W/L ratio, and title defenses (where she's first).
Again, different people weigh criteria differently (and might have their own categories too, like fame, whether or not they were a double champ, etc.), but with my criteria, it's clearly Weili at the top, then Joanna, then Rose. It's certainly not close enough to consider head-to-head record.