Vicksburg--cut the South in half
Gettysburg--morale victory for the North.
The Battle of Vicksburg allowed for the Union to take hold of a crucial point on the Mississippi and cut the western portions of the Confederacy off from the rest.
The Battle of Gettysburg provided a morale boost for the North and following came the Gettysburg address which set the tone for the war and motivated Union soldiers to continue.