i have both.

my rollers are kind of loud, and require pretty much constant pedaling and concentration. people might disagree with this for the purposes of demonstrating how skillful they are at using rollers, but if you get distracted, there's not much keeping you from hitting the floor. requires some practice clip in, pedal out of the saddle, etc. Still, great training tool. i got mine cheaply via craigslist. Side note: if you haven't already learned how to use these, the best i can give you is (1) KEEP PEDALING and (2) DON'T LOOK DOWN. the faster you pedal, the less likely you are to fall. if you get wobbly, PEDAL FASTER and you will straighten up.

my trainer is excellent (1UP is the company); silent and easy to throw the bike in. good for time in front of the TV or if you want to have kind of an easy spinning session playing video games while you pedal.

for the winter, i recommend both so you can vary things.


PS - people often are amazed that the bike doesn't fall when you use rollers; it's hard to explain gyroscopic stability. but it's easy to demonstrate. take a wheel (off the bike), hold it by the skewer, and wobble it around. easy. then spin the wheel and try that while the wheel is spinning, notice how it resists you. magic!