Set in the 14th century middle ages, a king led an army of 16000 men on a perilous expedition to steal fertile eggs from the dragon nest rest atop Mt Godamnhigh(fictional).
The king's advisor suggested to raise up their own dragons and train them for combat, a full grown adult dragon can stand at least 16m tall fly at a top speed of 90mph (unladen weight) non-stop across pacific ocean and had razor sharp claws capable of penetrating through 2m thick solid concrete wall with ease.
Despite being an apex carnivorous predator they will also consume at least 100 gallon of palm fruit oil and store them in a special sag around all its vital organs acting as a shock absorber and to allow the dragon to breathe fire with it.
The palm fruit oil will be converted into military grade napalm which cannot be put out by the likes of human, this isn't an evolutionary trait since all dragon loath the smell. Actually I still don't understand how the dragon learn to ignite the oil and spit it at its enemies, anyway this skill could only be taught as in passed down from the parents to their young!
The dragon in the wild is a solitary territorial cunning predatory animal and prefers sneak attack and ambushing it's prey over direct confrontation, however the juvenile are usually docile and enjoy hunting as a pack.
There is a rite of passage every young dragons must undertake in order to be recognized as a full fledged adult, the process involves killing their parents in a bloody brawl. Some claims that this allows them to think like a perfect killing machine. Their screech can be heard miles away and would prove deadly to human at close proximity.
Alright this is the first time I had written so much now back to the question, would domesticated dragons prove deadlier against their wild counterparts in a battle?
Note that the battlefield can take place anywhere. You may include human rider(s), and I promise to turn a blind eye for any underhand tactic used.