Duel of landscape gardener - my green paradise S05 E01 A swimming pond for the Hufschmidt family

Ulrike and Frank Hufschmidt from Lessenich (Mechernich) are fulfilling a lifelong dream with a self-built swimming pond. They want to be actively involved in the construction process - but which of the designs for the new pond, created by garden experts Frank Riese or Sebastian Burggraf, will win them over?