I think they both show the influence of Evans and Lange. Gedney seems more "detached" and documentary whereas Adams wants to "engage" his subjects.
Both are effective in portraying the "plight of poverty" although, to be honest, I think the Adams photo also subtly shows the "misplaced priorities (values?)" of some poor folk which dooms them to continued poverty. The late model pickup and "flashy, if cheap" bicycle stand in stark contrast to the rundown trailer home in the background.
This is the kind of "ingrained poverty" one finds up here in Copake. One where a well-worn trailer home sports a brand-new pickup in front of it and a DTV antenna on the roof. Arguably, this kind of disparity can be said to just be an "alternative lifestyle" since it goes on, generation after generation.
The Gedney picture, to me, is a bit more "uplifting" in the sense that it suggests that despite the daily poverty faced by these girls they portray a "spirited approach to life" that suggests they can rise above it all (as symbolized by the sunshine in the window?).
But then again, there may also be that spanking new pickup outside and that DTV antenna on the roof and no real desire to move beyond the poverty that has existed in the family for generation after generation.