Rend vs. OverPower for WW Barb

[stud4fun]

I noticed that several WW barb who finished G-rift 57 has Overpower - crushing advance.

I know there are someone good at calculation on skills with all those factors.
Can someone figure out which one is better between Rend bloodbath vs. Overpower crushing advance?

 

[Turnip]

Player barb is not greater than or equal to bot barb. Whatever is more friendly for bot player so probably rend idk im not a scientist.