Hi Arash, what do you mean by 'same job opportunities'?
Mandurah, Bunbury, or Albany are great places. All have the major amenities, like schools, hospitals, entertainment. Esperance is great, but it's WAY out there. Have you seen it on a map? Northam is a country town with not a lot going on unless you have a reason to be there. Denmark and Margs are just gorgeous places, but quite specialist in terms of employment opportunities.