Heinz is particularly bad, they use soy sauce and corn syrup, and I don't think ferment it at all.
Whereas Lea & Perrins use zero soy, and ferment the sauce.
The absolute worst part about it all is that Lea & Perrins was bought out by Heinz in 2005, and yet the Heinz branded sauce is still shit flavored water.
The original is still made the same way, and is still good.
True. That is a good thing.