The missing component in the decision between NYC and ATL is what your relative seniority will be within each base/category. You may be a lineholder with a commutable schedule on the 7ER out of JFK, but on reserve or flying un commutable trips out of ATL.

With both Delta and Jet Blue as options from AUS to JFK, plus UA into EWR, the commute to NYC is doable on good weather days.