Re: this or ford escort rs cosworth? R: I guess your refering to stock performance of both cars on a track. Then The M3 would be my choice. The M3 has a much better suspension and therefore can tear up corners like no other. If your reffering to when each of them is tuned, who knows? It all depends on the tuner. Both of them could get to outrageous performance marks, but i guess it would be easier for the novice tuner (Adds turbo, new exhaust, and wing (Some people refer to them as rycers)).