That’s the points! How to mark both answers as solutions? 
And to group both answers together:
So, both are:
-) KDE Pasma;
-) unstable branch of updates;
-) daily (or close to that) builds;
BUT:
(1) - untouched / pure unstable branch of updates (like officially for experienced users);
(2) - unstable branch of updates + KDE packages substituted by the once from kde-unstable repo and represents git versions of KDE packages for cutting edge KDE git updates (that’s why even more unstable) and mostly for developers or enthusiasts.
A bit more details on (2):
and