DX13 is absolute king. DX13 seems to retain and possibly improve on the likeness of the DX10 while at the same time has the advantage of battle damage to give that robotic stare some added character. The figure just tells you more about what the movie is about than the first two (first BD doesn't count here lol) imo. We'll see how much gets lost in translation with the production units.
Thats the thing - DX13 won't look that good when it comes out. The PERS will look more like what we've come to expect from the production figures.
The thing about DX10 is its not the same sculpt at all as the prototype and even on the prototype the PERS looked crap. Perhaps if we had seen a prototype of the actual sculpt we ended up with and then seen the usual disimprovement on the production run I'd be more critical of it myself. But as it stands it actually improved on the prototype we were shown.
DX13 looks great at prototype stage and will probably not look as good when it comes out.