Battery Connections

I was wondering which of the wires that connect to the battery would be easier to change. The black goes to the starter, the red connects on to other wires, and then I loose the trail.
I need to change 1 because of the location of the post on the new battery. Either way that the battery is in I have to change 1 of the wires. I just need to know which 1 (black or red) is the ground OR which 1 is easier to change.
Thanks

definately gonna be the black you have to be careful because all of the wires are hard to cram into an aftermarkert termanal.