Which is better, flossing or mouthwash? Or is a combination best?

I have recently started flossing again, and I love how clean my mouth feels after I’m done.

What I’m wondering is if mouthwash, which advertises itself as an effective tool against tooth decay, is another thing I should be adding to my daily routine.

Is flossing once daily enough? Or should I be adding in mouthwash, as well? (I brush, too.) Is there something else I’m missing?

Any advice would be great!