Aftermarket Fuse Block

I was planning on installing an aftermarket fuse block for some electrical installs I'm planning to do, however there are ones that are sold with a dedicated ground and ones with just the +12v connection. Whats the difference/purpose/advantages of having a dedicated ground on the fuse box?

 

I want to say that the dedicated ground is more of a boat thing to allow for easier access to a reliable ground. It really wont hurt to use the dedicated ground fuse box, but when the chassis is right there, there's really not much of a point.

 

I know this is an old thread but I just stumbled upon it. Hes right.. the dedicated ground is for boats and other things where you cant really find a ground.. with automobiles its really easy to find a ground so theres not much point in using the dedicated ground terminals on the fuse block