I have seen numerous threads about people comparing the S3 to the S4. I had a 2018 S3 for about a year and this past December traded it in for my current S4. Here my thoughts:
S3
The Good: Tossable, tight and highly fun chassis. Better steering feel than the S4. With a tune it makes just a hilarious amount of midrange power. Hideaway NAV screen was such a genius idea
The Bad: Small. So Small that I couldn't fit an air fryer from Costco in the trunk (opening too narrow), the back seats (door opening too narrow) and had to resort fitting it in the front seat like an idiot. Also putting kids back there is a pain. I never really liked the sound of the exhaust.
The Ugly: While the interior is nice. It never screamed out premium to me. Granted it's base on an A3 but still plasticky. Rode extremely rough. Would crash over bumps and loud on the highway
S4:
The Good: Refinement personified. It's quiet, poised, comfortable. Sounds so much better (IMO). Feels almost as quick (better low end power). Perfect sized for me.
The Bad: A bit more personality from the engine and steering. A tune would fix the engine personality issue.
The Ugly: The steering is just vague in feel.
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I hope that helps some people out!
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