Son of Reason: Gravis and Tulla

=
Recently, a group of campers found a book in a secret chamber near Zeus's Fist. There are 12 chapters in the book, each one written in a different language. This is a translation of one of the chapters. ======

Once many years before Percy Jackson was born, there were two sons of Ares, called Marius and Peter. They lived in Camp Half Blood and had gone on many quests together and were like brothers. While they were eating dinner one night they had a quarrel between the two of them; Marius believed that strength and endurance were more important in combat, while Peter argued that speed and agility were more important. They debated for most of the night but neither could sway the other, so they went to bed, angry of the outcome. In the middle of the night, both of them had a dream where Ares told them both to tell the Hephaestus cabin to construct two automatons, one would be incredibly strong and heavily armed and armored; while the other would be incredibly fast and lightly armed and armored. After the automatons were done, they would fight to the death to see who was right. When they woke up in the morning, they rushed to the Hephaestus cabin to request their automatons. The children of the volcano god agreed to build the automatons, as they were curious to the outcome. They told Marius and Peter to come back in five days and the automatons would be ready. Marius decided to name his heavier automaton Gravis, and Peter named the agile counterpart Tulla.

Who will win? Gravis (Stronger but slower, heavily armored, and heavily armed) Tulla (Faster but weaker, lightly armored, and lightly armed)