What have you found works better with Subscribe & Save – 10% or 5% with a 5% voucher off first subscription?

Curious what you have all found for those that have experimented with 5% S&S with a 5% off first subscription voucer, vs 10% S&S discounts.

We’re looking to marginally increase average revenue per product as we feel the 10% S&S long term is prices us too low vs our competition.