The L4 is a T-plate car, the R5 is a link car...2 different types of suspension but they accomplish the same thing: control movement of the rear pod. Typically (not in all cases, there are always exceptions), the T-plate car seems to handle bumpy surfaces better than the link car (think parking lot or tracks that aren't tennis court smooth), while the link car has the advantage on smoother tracks and carpet. Both cars can be tuned to be competitive on either surface, so don't feel like you have to run one or the other just because of the surface you race on. Driving style and setup have a lot to do with it, and we could argue which is better until the earth stops spinning. From what I have read, many newer drivers and those just stepping into 1/12 find the link car easier to turn a fast lap with, but the T-plate car easier to run a faster more consistent race with. Both the L4 and the R5 are both competitive cars with abundant spares, and both can put you in the winner's circle...six of one, a half-dozen of another!