Mountain Bike Saddles
Some saddles are very light weight and do not offer a lot of padding. Some saddles are heavier and offer a lot of cushioning. Generally, mountain bikes that have saddles without a lot of padding are more high performance oriented, while those that have more cushioning in the saddle are designed for leisurely riding. Some mountain bikes also have shock absorbent seat posts.
If you find that you like a higher performance mountain bike better than a mountain bike that is designed for comfort, but do not like the saddle, keep in mind that you can always switch the saddle out for a more comfortable one.