lol I have a really good one...
Emerald Weapon vs Ruby Weapon
I think that Ruby Weapon would win. It had more resistance to both physical and magical damage, and the only thing that really hurt Ruby was KotR, and Emerald doesn't have that. Also, Emerald's Aire Tam Storm wouldn't do any damage to Ruby since it is dependant on the amount of Materia that is equipped to the person it is attacking, and enemies in FF7 don't have materia so...