Taller climbers are better due of their height, whereas shorter climbers are better because they are stronger and, maybe, technically better. Strength is more important for the shorter climber. Technique is probably more important for the taller one. The best way to learn how to climb is by doing, so try going up some easy routes and have a go! If you want to improve your climbing then work on your technique. Practice making moves in different ways: one-handed, two-handed, backwards, with your feet... The more techniques you can do correctly the more options you have when trying difficult moves. Also practice using your body as much as possible. For example, if you need to lift your leg over a rock barrier then bend at the knee rather than standing up straight. This will help you avoid injury while still allowing you to climb safely. Finally, find a group of people who are willing to help you learn and have fun together!