This is definitely a Song Sparrow.
EDIT: I will explain my reasoning.
I would expect Savannah to have a white crown stripe, yellow supercillium behind the eye, overall lighter coloration with crisper streaks on the breast and crown and fewer breast streaks. I would also expect it to have a lighter, cleaner breast than this bird, which is a grayish, dirtier looking breast typical of Song. The bill is also pretty dark on this bird, suggesting Song.
I would expect Lincoln's to have a buffy malar, grayish face above the eye, very very crisp breast streaks, with buffy wash across the breast and down the sides. This bird shows none of those field marks.
