Though I run with the family, my main cardio is from my stationary bike. I prevent getting bored through being extremely active with my hands by performing various forms of plate weight cardio, and using the stationary bike during "active rest periods" for short burst cardio by placing some weight on my thighs and/or performing plate weight cardio. I tend to like the privacy and self meditation. My entire motive is the purpose and goal at hand, and nothing else. No TV, No reading, and the amount of intensity I require, wouldnt allow it anyway.
A staionary bike can serve the goal purposes just fine, but it will come down to your personal preference.
Best wishes,
Chillen