#1 Cris Cyborg (20-1-1, 5-0 in the UFC)
Honors and Accomplishments
One-Time UFC Women's Featherweight Champion
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Former Invicta and Strikeforce Women's Featherweight Champion
Undefeated since 2005 with 19 wins and 1 NC
Notable Wins: Gina Carano, Holly Holm, Tonya Evinger, Charmaine Tweet, Marloes Coenen, Fiona Muxlow
I was tempted to put Nunes on the top spot, after all, Cyborg does have a tainted past with a documented history of her PED usage. However, even without bringing up the PED argument, it's tough to think of anyone who can beat the freak of nature that is Cris Cyborg.
Cyborg is a knockout artist of the highest order and easily the best female fighter in MMA history. She could even give some of the male UFC fighters a run for their money, that's the level of superiority that the Muay Thai Black Belt possess. Her Brown Belt in Brazilian Jiu-Jitsu makes her lethal on the mat as well and all in all, Cyborg is a nightmarish opponent for anyone who claims to be the best.
Ronda Rousey was billed to be the woman who could have taken Cyborg down but we just can't imagine that happening anymore. The only fighter who has the acumen to pull off the aforementioned feat is Nunes and we just can't wait for the two Brazilians to throw down at UFC 232.
The winner will be labeled the best female fighter ever, it's as simple as that.