I have a fluid trainer that I use in the winter, but I've never used a roller. What I have heard, though, is that trainers give you more of a resistance work out and rollers are more for spinning and technique.
I bought a fluid trainer last year with a five-level resistance setting. The top levels can really give a workout. I do not see rollers with resistance levels on them.
Depends on the rollers. My rollers by Inside Ride do have variable resistance and the resistance at the highest level is much greater than my Cycleops fluid.
Pros: greatly improves your spin and fluidity, forces you to concentrate during the workout, improves your ability to ride smoothly and in a straight-line on the road, seems like more of a workout than standard trainers.
Cons: forces you to concentrate during the entire workout (no zoning out and just spinning), hard to stand/sprint on some models (but not the Inside Rides), harder to drink or towel off on rollers, take some getting used to
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