Sort:  

Its hard because its so unpredictable. There are more variables then two. Such as ... Did both fighters have full camps ... is one moving up or down in weight ... Did they fight before ... comparable opponents .... tough weight cuts ...

But most importantly .... MMA is very unpredictable. For instance there was an event last year that every single underdog won costing online bet sites millions of dollars. Lots of people made a small fortune.