Mobile device repairability is typically defined by part availability and if the device is able to be disassembled without damage. Apple iPhones and Samsung Galaxy phones typically have the best parts availability, followed by Motorola, LG, and other big name Android Manufacturers. We use proper iFixit tools and guides for any job we can to ensure the device is not damaged.
iPads, and notebook PCs such as Dell, Alienware, HP, ASUS, Acer, etc are also very repairable. Chromebooks can be more difficult due to the deivces being so cheap it can be more expensive to repair in some cases, and the reduced price typically means more integrated components and less repairability..