If the comparison review of the Dragon and Tristar ausf.D is any indication the Tristar/Hobbyboss might have edge in accuracy. http://perthmilitarymodelling.com/reviews/vehicles/misc/pz4d/pz4d.htm
That particular review indicates that Dragon is more accurate.
I read Tristar is more accurate in that review:
"If you strip away all the eye candy, the minor errors and additional optional parts from the Dragon kit and look at the basic dimensions against those of the Tristar kit we clearly see that the Tristar kit is the fundamentally more accurate of the two...."