all i can go by is what ive seen of them both. they seem fairly equal in terms of defending to me. both have their moments where they do well and both have had 1 or 2 slip ups. amavi is better going forward. maye the plan is to play with attacking fiull backs, hence the 2 defence midfielders, be it jedinak tishibola or westwood.
you have a different opinion and thats fine by me