I'm not riding as much as I should be, thanks to the weather, and the short days. (Sunset is 4:19 pm today.) I'm thinking about getting a set of rollers. I'm not really interested in Zwift, I'm doing squats etc at the gym for leg strength, I just want to do longer "rides" at anywhere from 100 to 300 watts depending on the day. I feel like rollers will be a bit less boring than a trainer, and I welcome any improvements I might make to my pedal stroke.

Some rollers are cylinders, some are parabolic - wider on the ends than in the middle. It seems like that would be nice when your mind wanders.

Which would you choose? Does it matter?