Beginners in model aviation often become involved with soaring because it is usually easy to learn. Gliders are designed to be both strong and lightweight. With careful flying a well built glider can last for many years. Generally gliders are built strong enough to take the punishment of high speed launches and still fly slow and gentle so they can benefit from even a small amount of lift. This slow speed capability and their strength helps gliders to survive very well.
Gliders are a little easier to build than powered airplanes.
They don't have engines so you don't need to install that or a motor mount, gas tank, cowling and throttle control. The only landing gear to install is some form of skid and this eliminates more building work. Installing a tow hook is something you will have to do that you wouldn't need on a powered airplane. Gliders have small fuselages and radio installation can be more difficult. It is best to build gliders carefully to keep weight low and strength high.