There is no definitive answer to this question as it depends on personal preference. Some people prefer a smaller bike with 20-inch wheels for doing tricks and jumps, while others find that a larger bike with 26-inch wheels is better for stability and going over rough terrain. Ultimately, it comes down to what you feel most comfortable riding and what works best for your individual style. You may have to experiment with different bikes before you find the perfect one for you, but that's all part of the fun!