I have both...I use the trainer more because in the MN winter that's my primary for of cardio exercise (aside from table tennis ) so on the trainer I'm usually trying to burn as many calories as possible. I use the rollers to provide another mentally different way of working indoors. Neither is better, both have their place. And, as another poster mentioned, if I lived in SoCal I'd have neither. Eff all you people who live in year 'round warmth