Teeke
Lord of Altera
Maintaining typical stance, I tend to lead with my left.I mean, you can dual weild fencing sabres, because you can slash, parry, etc.
But an offhand rapier (Or Foil, Epee, etc.) is a narrow, thin, piercing instrument.
One rapier is used more for deflecting blows, generally done with the off hand weapon.
The other is used as your primary weapon.
As I mentioned, I don't typically dual wield.
Reasoning:
It's tiring.
It's complicated.
It's not the best method.