the difference between the rs and 4.1 are basically the electrics.the shock towers on the 4.1 are slightly different but not a major change.the electrics in the rs were not the best(plastic gear servo,brushed motor which was rubbish) .the 4.1comes in 2 versions,brushed and brushless.they both have 2.4ghz transmitters and metal geared servos.personally id go for the brushless version (although it would need to be upgraded as your driving skills improved) at club level the rtr b4 is fine,i have run an rs and ft and really not found much difference(been racing on/off for nearly 20 years)found the rs very easy to drive with the stock setup with blue front springs and silver rears.the ft is sharper to drive but thats mostly setup changes.hope this helps
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