In preparation for those wet winter days I'm considering my options for inside cycling fitness. Last year I hired a treadmill which significantly improved my fitness but wasn't great on the knees. Having not used either before, any suggestions on whether I'm better off getting a spin bike or a trainer?
There is a guest article on Velominati about the spin bike here. If you can get over all the 'rules' fluff it has a nice sentiment.
All of the things I described above came to mind and I was sure that I’d never do it again. However, after a while, a funny thing happened. I got over the differences in geometry from my road bike; I got over the annoyingly short crank arm length and annoyingly wide bottom bracket; and I got over the weird feel of the flywheel and the squishy, outrageously non-Rule 61-compliant saddle. Instead, I cranked up the tunes and started focusing on form. Without traffic or weather to contend with, my mind was freed for deep, unbroken meditation on the rhythmic movements of my legs and the way my whole body was working together to achieve the Magnificent Stroke. The spin room is surrounded by mirrors, so I was able to watch my motions and correct irregularities. My imagination wandered, and instead of being in the spin room, I saw myself ascending the twists and turns of L’Alpe d’Huez. In short, I was channeling Rule #6 and finding the V-Locus.
When my time was up, I jolted out of my reverie with something akin to shock.