That is a great question but it may be the wrong question to ask. Most of the Drexel Hill area is in Upper Darby. (Some in Haverford Township). If you are an investor you should also be looking at the local tax structures. it is true that Drexel Hill has good rental income but it also has some of the highest real estate tax structures in the county. You may receive higher rental income but it may be erased by the higher taxes. the secondary effect is that the appreciation rates may also be lower due to the real estate taxes.
It makes sense to consider all of the factors and to calculate the return on your investment based on many other factors, age of property, deferred repairs, real estate taxes, access to public transportation, potential for resale, subsidized rental availability, vacancy rates and a host of other considerations.
I have managed many properties in Drexel Hill. It is a great area for income but income is only one leg of the stool.