Yukata geta are made from wood, and when you walk, the wooden soles make a sound when they hit the ground. They are worn barefoot.
Zori sandals are worn with kimonos. Zori sandals are made from flexible materials such as cork or polyurethane. They are worn with tabi socks.
Wear geta with a yukata and zori with a kimono.
Choosing a slightly smaller size is the key to making them easier to walk in.