Experiment for yourself is the best advice. I know many will say source first, this wasn't so in my case. Your room, your gear, your setup and your ears are different. That's why they make so many different flavors.
BTW, if your components are plugged into a power conditioner, you may find that a cord on the power conditioner is the best place to start.
BTW, if your components are plugged into a power conditioner, you may find that a cord on the power conditioner is the best place to start.