I'm noticing quite a few distros switching away from the Xorg package and going with the Xserver package.

At least, that's what Distrowatch shows.

Anyways, what's the difference? I mean, if distros are switching to XS1.3 obviously it's better.....?

Smaller? Faster? Less buggy? Easier to program and manipulate?(developers choice)

All of the above? I've found some information about Xserver in that it's based off of Kdrive, but from a comparitive standpoint, what's the difference and/or benefits?