I moved from all indoor workouts on the trainer to all indoor workouts on the rollers a couple of years ago. I am comfortable enough now that I can watch TV or have a conversation with someone else in the room while riding. I can also drink from my water bottle, stand a bit (this is still pretty hard for me) and change speeds to do interval work. My HR is ALWAYS higher on the rollers than it ever was when I used the trainer.

For me, the rollers are more interesting and have GREATLY improved my pedal stroke, form and handling skills on the road. I know you're not looking for that, but it is a nice benefit.

I can also ride the rollers for a couple of hours, though an hour is more typical.

If you HAVE to ride inside, either will work well for you. The rollers just have a steeper learning curve.

SheFly