By and large, I feel if you build the aircraft, it will be of much better quality, that will last longer. Also, the final assembly part of the build (which is basically all there is with an ARF), I find much easier with kits or scratch builds. I like to have all of my linkages installed prior to covering. I also like to install rocket tubes in the wings to make cable routing easier. I find it takes 3-4 times longer to final assemble an ARF over a kit. Plus, I just cannot stand plastic film coverings. Especially on a fuselage. They just wrinkle and do not last.