For me S is better then RS ... because you have a S interior Full and 507 hp Serie is good enough for what you need more .. or Audi S3 With 310 hpAudi Rs3 With 400 hp ... Only 90 hp more ... nono for me S is enough and we dont need a Rs
the SQ8 is an diesel,has about 430PS, it has 900nm. the RSQ8 is petrol and it has about 600ps and 800nm. and because the sq8 is an diesel it has a better launch. Diesel cars are better for launching but at top speed is the rsq8 better.