the RS is a fantasitc car, no doubts, but the comparison of the S4 must be made in the light of the £'000's saved and whether the difference is worth it.
For me, by selling the RS, I banked best part of £6k, went back 20,000 miles & a year younger when I got an S4. Coupled with the lower running costs we're talking quite a material monetary difference to consider.
in terms of the cars themselves, IMO i must stress, I find the S4 a much more "compact" and "sporty" cabin to be in. The RS6 is very big inside and so lots of expance around you - great if you need the space! Back seats, no comparison, RS is like a limo back there, S4 is like a hatchback !
Also as its based on the A6 which came out in 199X, the S4 cabin feels more modern IMO
Both models have more or less the same level of options available, that are important anyway (eg. bose, RNSE, cruise, heated seats etc) - also mines got a colour DIS which gives different sat nav instructions vs the RNSE in my RS.
As for looks, cant beat the bulging arches of the RS !!! S4 is a conservative looking car, but FYI, the B7 A4 DTM OEM side skirts fit perfectly and give it a more agressive look.
Speed - RS wins hands down, turbo boost is crazy, but S4 is no slouch. The NA engine has a very difference dynamic to the boost on the RS6, defo have to use the revs more, but thats not a bad thing to hear the V8 sing ! I've got a manual myself and having to rev in a manual give me a great thrill of driving over the sometimes sedate auto on the RS. Though put the RS in S and its a caged animal !!
Driving - I find the S4 more agile than the RS, maybe to do with weight / size not sure. I only had the standard DRC so cant comment on how a modded RS would feel, but certainly after chucking the S4 down country lanes it feel more agile than the RS would down the same roads
Ride comfort - the S4 is much more comfortable, the ride on the RS was HARD ! i could put up with it, but defo noticed the improved ride in the S4, though if I stuck 19"'s on it it might be different.
Overall, IMO, I would say the RS is a mental car, and if you can afford it, you've got to do it. Just look at it in black and white 450bhp, or 500 with a remap - those are serious figures ! Although as discussed at length it does have the running costs to match
IMO, if you can find a decent S4 at a decent price - go with that and you wont be disapointed.
IMO - If you can afford a GOOD RS, go with that and you wont be dissapointed, but you're wallet will never be the same again !
apologies for long post
