Which exhaust is quieter ?

[Kawasakieric]

Which slip on exhaust is quieter the Cobra Tri Ovals or the Vance & Hines Slash cut. I have the stock exhaust on my Vaquero with the 2 rear baffle plates removed. Looking for something more but don't want a radical change.(have to keep the passenger happy). I've ridden one with the Vance and Hines and was hoping the Cobra Tri Ovals may be a little quieter.