I'll try and answer this objectively:
They are largely based on the same 8V MQB Chassis, so the easiest way to see this is to hypothetically put an 3S SB and an RS3 SB side by side:
Some external differences; slightly flared arches on the RS3, and different sills, spoiler, front bumper and exhausts.
Internally, and configured the same on the audi configurator, you could get them to be almost identical apart from some badging.
The real differences are under the bonnet: engine, brakes, exhaust, suspension and quattro system.
So: no real 'toys' as such, and many non-petrol heads will not really know or appreciate the difference between the S3 and RS3 8V A3 variants.
Some like the understated look - some don't. Some don't believe that the RS3 represents value for money (so won't buy one), some believe that it does (so do). There will always be a body of those who are so self opinionated, one way or another, they will try to convince you that you are not capable of making your own mind up, without listening to them - but you are.
There's no denying they are from the same stable, and could be seen to be visually similar.
At the end of the day - only you can decide what is right for you, and nobody is, or can, force you to buy one car or the other.
