Back 4 or back 3?

Leno

Sokratis
Koscielny
Xhaka

Lichsteiner
Gwen
Torreira
Kolasinac

Ozil

Aboomerang
Lacazette

Or

Leno

Lichsteiner
Sokratis
Koscielny
Kolasinac

Gwen
Torreira
Xhaka

Ozil
Aboomerang

Lacazette