I've never used Liquid Soveran, only the paste version (which is an incredible but pricey wax). I have used Carnauba Moose and on most colors (except maybe light metallics), I prefer it to S100.
Both are going to be very, very comparable. I would say that the Carnauba Moose has a slight edge in durability, but other than that, whatever you choose from those two are going to be extremely similar.