2) You can't quickly gather 200 golems, which means you played for quite a long time, and Dungeon is not as strong in the late stages of the game as it is in the early and middle stages.
3) In a long game, the Academy has the opportunity to create good mini-units, which significantly strengthens their army.
A lot depends on the battle tactics and the correctness of the moves. In general, having a good head on your shoulders and skillful hands always decides the outcome.