We need a few for specific data collected from various sources and companies.. like spring rates (i.e. purple Tamiya vs. purple XRay), motor technologies (differences between Epic/TOP/Checkpoint/V2), brushes (wear and performance characeristics between 767's and F-lines, and what does drilling holes/shaving sides do?), brush springs (what will purple/red. do compared to red/red?) , tires (temp ratings and wear characteristics), all laying out what's out there, and what they do.. some can be more objective than others, though, but at least it'd be out there..
Anyone care to try