LAS/Zombie: Why don't we examine some facts, those are usually a good place to start: Senators entered the NHL in the 92/93 season, beginning in that season:
Senator Playoff Teams: 11
Leaf Playoff Teams: 10
Edge: Senators
Senator Conference Finals: 2
Leaf Conference Finals: 4
Edge: Leafs
Stanley Cup Finals:
Ottawa: 1
Leafs: 0
Edge: Ottawa
Head to Head
Leafs 4-0
Edge: Toronto
So they've been pretty even in terms of playoffs made, leafs have had twice as many conference finals and the leafs have dominated the sens in the playoffs 4-0 (sure the sens get props for making it to a cup, congratulations, I wish the leafs would make it to a cup), I'll let you draw your own conclusions.