Hang gliding will get you farther. Whichever you choose, weather is a key element. You'll become a weather expert, able to read all the cloud formations. All gliders use thermals to gain altitude. Back to your science 101 class, warm air raises.
Thermals are bands of warmer air raising.
The goal of a glider pilot is to find thermals, so they can gain altitude and fly for a longer time. Becoming a glider pilot is similar to becoming an airline pilot. You'll need airtime to become an expert. There are 6 levels of pilot ratings. Additionally, you will learn about your equipment, how to rig and de-rig, how to launch, control and land the glider.