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In most if not all games, even numbers is the best way to make things fair. Player skill level that is a different story.
You ever play a counter strike or battle field game where its 2v10? 12v30? No the system automatically balance it out. Win/loose are determined by the group work and skill of the players once the team are close to even in numbers.
In a game like age of conan, where all class have extremely cheesy abilities that does insane amount of dmg, and it is super noob friendly YES balancing numbers make it MORE fair.
if today in aoc you can take on 2-5+ players at once if you are extremely good then, balancing numbers dosnt really matter, then I'd say opponents need numbers. But that is not how this game works, you can barely even do 1v2 vs even noob players, because each class have stupid abilities that does quick burst dmg and insane amount of crowd control in this game to lock someone down.
All in all, close to even number pvp will always be the best, I guarantee you both side would have fun as it does usually on tyranny. Each side learns to play better and get better its a progress a learning curve. If you have more players, then there is no reason to improve.