Sorry, no experience with either.
Supposedly the king of slip-ons are the Sato's low (standard) mounts.
My bike had a full system on it when I bought it used, so I replaced it with a full race Akrapovic. As such, I have never used slip-ons.
Others may be able to answer your question.
Bear in mind that for street use, mid-range rules.
Better to have great mid-range than top end.
Supposedly the king of slip-ons are the Sato's low (standard) mounts.
My bike had a full system on it when I bought it used, so I replaced it with a full race Akrapovic. As such, I have never used slip-ons.
Others may be able to answer your question.
Bear in mind that for street use, mid-range rules.
Better to have great mid-range than top end.