Assume you get even trades on both sides, which team would benefit the most?

For the sake of simplicity, let's additionally assume that the agents have no abilities whatsoever and no additional information could be gained by trading. Purely assessing benefits by the number of equally skilled and equipped players.

Naively speaking, I would assume that the attacker would have an advantage due to the defender having to cover the same number of spots with less people.

What are your takes?