Been out with my D4 and the sons Puma many times.The Puma does have KM2's,and a 40mm lift.D4 is stock with A/Ts.
Point them both up a steep rocky rutted hill,and the D4 does it the easiest.Take the wrong line to make things difficult,the Puma will often go no further where the D4 keeps on going.
But the Puma does have much better approach and departure angles,which is very handy at times,although it does have diff pumpkins that can hang it up.
The D4 body is also more vulnerable to damage:(,whereas the body on the Puma sits higher up and also has the straight body panels.
And for the people that don't like Traction Control,the Puma recently had a fault which caused the TC not to operate.It definitely went further in the rough stuff with the TC on.
This may also have been more noticeable,because our driving styles were used to the TC operating.
And as for those deep water crossings,the D4 seems to chicken out,where the Puma trundles through no worries:)

