Brief analysis I can think of off the top of my head
Carlos
More diverse striker: uses more knees and elbows, throws more kicks including oblique kicks
Power: decent power
Accuracy: good accuracy; strikes well at various angles
Range: very good at distance and in close
Footwork: showcased in the Diaz fight; does well moving forward or countering
Grappling: wrestling is very weak but attacks off the back are only 2nd to Diaz
Chin: solid chin never been tkoed. Last time rocked was vs Ellensberger iirc (maybe big rigg)
Cardio: insane
Robbie:
Very good boxing. IMO better than Condit. Throws some kick but mainly hands.
Power: devastating power. More power than Condit imo
Accuracy: not quite as accurate as Condit but throws a better jab.
Range: devastating in the mid range
Footwork: good footwork but always does better when moving forward
Grappling: vastly improved defensive wrestling. Never shown real offensive grappling
Chin: solid chin. Only ko loss to Diaz. Rocked in last fight
Cardio: vastly improved. Can go 5 rounds and did in last 2 fights
Both guys prefer to strike. I see it staying on the feet but can't pick a winner. I lean towards carlos as long as his knee is healthy but if anyone can ko him it's Robbie
Did I miss anything? 
Oh.
Wow.
Woah. 