Each one has pros and cons, perhaps my opinion could help clarify a couple of things and hit some reality facts. I also had a S3 before and I absolutely loved it but now I have a RS3 and I also love it. I personally love compact cars and the RS3 is just perfect for me because I am your average height and your average weight and we don't have a big family therefore everyone fits perfectly on the RS3.
I also have a (B9)S5 sportsback which has a large trunk and also fits 4 comfortably. As far is exteriors, I think that both cars looks good (RS3 and RS5) although I would say that the Sportback looks sleeker than the coupe and that is not just my opinion, I am talking about the sales ratio being much higher on the sportsback because it is far more functional and it looks very good.
As far is performance, , they are very similar, as a matter of fact, I posted a RS3 vs RS5 comparo straight from Car and Driver and the RS3 had more favorable numbers although maybe in real life the RS5 is probably in same terms of performance.
RS3 vs RS5 link started by me last year :
https://www.audizine.com/forum/showt...ted-comparison
The price is a key point here and here is why. You can negotiate some what the RS3 price, it really depends on the dealer and the allocations, some dealer don't have any allocations at all and therefore your only choice is ordering one from factory which can take easily 6 months or you can have one shipped from another dealer or travel yourself to another dealer to get a slightly better price. On the other hand, the RS5 are literally everywhere, dealers have 4, 5 , 6 even a dozen RS5 on their dealerships(look in Los Angeles and you will see what I am talking about).
There is no shortage of RS5 and therefore the prices can be negotiated much better but there is more demand on the RS3 and that is why you don't see them as much plus limited production.
If I had the money I would go for the RS5. It is more refined car than the RS3. The interior of my fully loaded $68,640 S5 looks like a spaceship compared to my $61,000 RS3. The interior of the RS5 looks better(in my opinion) but if you are conscious about your money and don't want to spend that much you can still get the RS3 and be very happy with it.
Good luck and let us know if you have any other questions or concerns.
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