Well......just to throw a spanner in the works I'm going to somewhat disagree.
Dean Park is made up of a similar demographic to Shalvey. I think both suburbs should be looked at from a street to street perspective. There are some shocking places in Shalvey, AND some nice ones too. If comparing apples to apples, then Dean Park could perform better, but if we are comparing a really crappy street in Dean Park to a private area in Shalvey that has mainly good tenants/owners I know which I would prefer. Whether you are living there, or renting, you don't want to be situated next door to the local drug dealers or gang leaders.
I would look at everything in the deal before choosing which property would be best.