I think the topic maker does not suggest who is better RAT or Sanchi.. the TM is asking who do you hate the most.
Its our personal feelings not comparison between sanchi and Ratan as human beings.
RAT is pure evil and Sanchi is a brat so def. Sanchi is better.
But as the question states who do you hate the most? You as in the viewer as in ..me. I as a viewer who hates more at this point.
That is why i think many of those who said sanchi ... stated her name. For me I hate her more cause RAT is not even human. You expect such disgusting things from him. So he hasnt really gone below our expectations but Sanchi on the other hand coming from a well groomed, well respected and well balanced family has such demeaning and disgusting thoughts about her own family member. Which makes me hate her more.
So really the comparison is not between sanchi and rat, rather the comparison is between our feelings for sanchi and rat.