My point was that in Practice mode you can set the course conditions to what you want but that you have to play with Putt Preview, a feature that I'm not a big fan of (at least not in multi player games) and the only way to not play with Putt Preview is to play in Scored mode where you lose the ability to choose your course conditions. When I said advantage I was more referring to it being an advantage to have the ability to set the game conditions to what you want. It wasn't about having an advantage in the game over your opponent.
As far as I see it Putt Preview should be limited to SOLO Practice rounds and the practice putting greens. It should not be available in any type of multi player head to head game modes. Or at the very least have the option to turn it off.
I believe in all the Multi player game modes, when in scored mode everyone plays off the same conditions (tees and green speed included) as it sets it off the highest tiered player in the group. But I could be wrong about that as it's been quite some time since I've played a Alt or Match play round.