A custom pro scooter build will almost always be of much higher quality than a pre-built one in all aspects. Custom scooter builds consist of all aftermarket parts. Manufacturers typically make aftermarket parts with features and details catered to more demanding riders, so piecing together a custom pro scooter will give the rider a more progressive and technical scooter build.  Of course, another huge benefit to custom builds is that you can select each piece to your liking in size, weight, colorway, and design instead of being limited to getting a pre-built out-of-the-box scooter.