Chaos-Esque Anthology has little things coded in over the years like:
Bullet Deceleration in Water (along with trails) (thus you can use water for cover like in real life)
Blood splatter on walls when bullets pass through players (noticed Unreal 97 had this, and Xonotic didn't, so it was coded in).
and various other little niggling details that were noticed as absent and programmed in over the years.
It also has big things like the tons of added weapons, and all the rest that has allready been mentioned.
Xonotic itself could be prone to puritanism: one of the devs wanted to strip out all the player models and replace them with only robots so it is "less violent" (don't think they did it, but it was discussed).
Chaos-Esque doesn't entertain such thoughts.
Xonotic has code churn from time to time when a dev decides to refactor everything in the "right way". Samual did this once, and later some new guys refactored the whole thing again.
Chaos-Esque does not do this. It refines the codebase it has. The machine doesn't care how asthetic ones quakec dialect appears to humans.
(Rewriting codebases for no reason can reintroduce long banished bugs).
