| I have both.A trainer is good for intervals and warming up before races. Some times they can be a pain, though they have gotten better the last couple years. My old trainer is very loud, many newer ones are quiet. Mine will only accept old style skewers, newer trainers accept the newer flat skewers. They can wear out your tires. Rollers are good for smoothness, if you're not, off you go, so they are a skill that you would have to learn, but you'll look cool! I like rollers for recovery rides, less boring than a trainer. You can get resistance for rollers, smaller diameter rollers have more resistance. My rollers have a fan attachment and the resistance can be varied.
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