We don't have a manual for this treadmill and want to know how to program it to the preprogramed workouts such as cardio, fat burn etc. Also how do you fold it/ We have been looking for a manual online but haven't found one yet. Thanks for yopr help.

There isn't a lot of difference between them. Cardio is all about getting you heart rate higher so Treadmill or Bike is often down to which you personally prefer. You could also use a rowing machine to get the same cardio workout.
The biggest difference is mostly which muscle groups your using to pump up your heart rate.

I don't know (yet), but I'll soon be able to help you though! I have just bought a treadmill that is similar to yours (it's the Lifespan TR1200, mentioned here http://www.your-workout-routine.com/cardio/best-treadmills-2014/).
But hey! You could ask in the store you bought it, can't you?

Whereasa treadmill provides an "impact" workout, elliptical machines provide a "no-impact" workout. This makes workouts on the elliptical trainerhave much less stress on the knees, hips, and joints.

If a cardiovascular workout is what you want, you should get an elliptical machine. They give you a total body workout - with handle bars for your arms and pedals for your feet. You can burn a lot of calories without having a lot of heavy impact on your joints.

Here's what the Sole exercise equipment makers say about calorie counters on exercise equipment. it's from their E-95 users manual: "Calorie readings on every piece of exercise equipment, whether it is in a gym or at home, are not accurate and tend to vary widely. They are meant only as a guide to monitor your progress from workout to workout. The only way to measure your calorie burn accurately is in a clinical setting connected to a host of machines. This is because every person is different and burns calories at a different rate. Some good news is that you will continue to burn calories at an accelerated rate for at least an hour after you have finished exercising!"