Duel of landscape gardener

A green oasis of well-being for Anna and Christian Dojen (Episode 126)

Anna and Christian Dojen live in the former working-class district of Rheinhausen in Duisburg. Their backyard is dreary and covered with exposed concrete slabs. They want to create a green oasis of well-being there. Which gardening professional has the right concept for this: Marius Surmann or Nico Sollazzo?