Autoblog and Yahoo may earn commission from links in this article.Comparison: 2026 Audi A3 vs Audi A4As far as junior luxury sedans go, the Audi A3 is a solid and competent choice among its peers. The thing is, a used final-generation A4 can be a viable alternative to a brand-new A3. Given that it had been succeeded by the A5, the old A4 might just come out as the better-value option here over its more compact sibling.So the question now is: does one go for a brand-new but smaller car or a used but larger vehicle? It's a classic conundrum, but this time it's A3 vs A4.AudiView the 2 images of this gallery on the original articleProduct Positioning: The Neighbors Can't Tell the DifferenceFor car people, the difference between the A3 and A4 Audi models may look like night and day, but most folks will be fixated on the four rings on the grille. That, ladies and gentlemen, is the power of branding and perception. But while styling for both follows the philosophy of sausages cut in different lengths, the positioning is relatively far apart.AdvertisementAdvertisementThe A3's smaller footprint supposedly makes it the sportier and more spirited option compared to the A4. That doesn't mean the A4 is any less dynamic, but as it's a step up from the A3, it tries to blend in more comfort and refinement. On that alone, the A4 is the one to get, right? Again, one's new, and one's used, and the casual observer will probably just notice the badge and not the whole car attached to it.AudiView the 2 images of this gallery on the original articleSize and Space: A Bigger Body Doesn't Mean Surplus RoomThe Audi A3 vs A4 size matchup is straightforward from the outside. The 2026 A3 measures 177 inches long, 71.5 inches wide, 56.1 inches tall, with a wheelbase of 103.8 inches. As for the A4, it's 187.5 inches long, 72.7 inches wide, 56.3 inches tall, and has a 111-inch wheelbase, so it's a much larger vehicle. But just because it's larger on the outside doesn't necessarily mean there are acres more space inside.Despite the sizable differences in dimensions, the A4 has just a tenth of an inch more front legroom and half an inch more rear legroom than the A3. In terms of shoulder width, the A4 holds a 1.1-inch and 1.5-inch advantage over the A3 for the front and rear, respectively. As for headroom, the A4 has 2.2 inches more at the back. That said, the biggest difference here is the cargo capacity of 12 cu.-ft. in the larger sedan versus 10.9 cu.-ft in the smaller one. Overall, the A4 is still more spacious, but the A3 makes better use of a smaller area.AudiView the 2 images of this gallery on the original articlePerformance and Economy: Surprisingly Even in EfficiencyFor engines, the A3 is only available in one configuration in the U.S. Dubbed the 40 TFSI Quattro, it comes with a 2.0-liter turbocharged engine producing 201 hp and 236 lb-ft of torque, with all-wheel drive standard. Prior to its discontinuation, the A4 offered two 2.0-liter turbo options: the 40 TFSI Quattro and the 45 TFSI Quattro. The 40 had the same output as the A3, while the 45 ramped up the power to 261 hp and 273 lb-ft. All-wheel drive was also standard in the A4.AdvertisementAdvertisementWith its lighter body, the A3 40 TFSI Quattro edges out the A4 with the same powertrain combo to 60 mph, doing so in 6.0 seconds, three tenths ahead of its big brother. That said, the A3 doesn't have an answer for the A4 45 TFSI Quattro, which can reach 60 mph in 5.2 seconds.But what's surprising here are the EPA fuel economy ratings. One would think that the smaller, lighter A3 would easily beat the A4, but that's not the case at all. Per official government figures, the A3 does 24 mpg city, 34 mpg highway, and 28 mpg combined, while the A4 posted ratings of 26 mpg city, 35 mpg highway, and 30 mpg combined for the 40 model, and 24 mpg city, 32 mpg highway, and 27 mpg combined. Of course, real-world results will vary.AudiView the 2 images of this gallery on the original articleTrims and Pricing: The Used A4 is Understandably TemptingAudi A3 vs Audi A4 specs and trims? The 2026 Audi A3 is available in three trims, namely Premium, Premium Plus, and Prestige. The Premium starts at $40,100, while the Premium Plus has a base price of $43,000. As for the range-topping Prestige, that carries an MSRP of $45,700. As for the A4, it had the same trim structure as its smaller sibling, but for its final model year in 2025, all versions of the 40 TFSI Quattro were dropped in favor of keeping the 45 TFSI Quattro models. In 2025, prices ranged from $44,100 to $51,300.AdvertisementAdvertisementBut say you see a used 2025 A4 being offered today, what's a fair price to pay for it? According to Kelley Blue Book, it hovers between $38,600 and $40,900, depending on mileage, condition, and other factors that may affect resale. It's a tempting proposition, especially if you're looking for the more powerful 45 models, and it's possible to get it for less than that, especially for older model years.View the 2 images of this gallery on the original articleFinal ThoughtsTruth be told, an A3 is good enough for most, and a brand-new model does come with the advantage of a full warranty. Don't forget that Audi Signature Care comes standard, so there's literally no excuse to skip scheduled maintenance, as it covers the first 30,000 miles or three years of services (every 10,000 miles or once a year), whichever comes first. Performance is good, it drives well, and it is surprisingly space-efficient for its size. Standard all-wheel drive helps, too, and what some may call a conservative design means it won't look dated for a long time. The updated 2027 model has also been revealed and is expected to land stateside soon.We won't stop you from choosing a second-hand A4 over it, though. The discontinued sedan still ticks all the right boxes, and buying a used example with some warranty left is a deal one shouldn't miss. But as with any second-hand European car, regardless of age, due diligence isn't just recommended - it's required.AdvertisementAdvertisementTo sum it up, the A3 is a solid bet as it is, but the small trunk might turn off some folks. If your commutes involve a lot of miles, the A4 might be worth considering, as it's the more refined vehicle. But if it's more power without resorting to the S and RS versions, the A4 is the only way to go.AudiThis story was originally published by Autoblog on Jul 19, 2026, where it first appeared in the Features section. Add Autoblog as a Preferred Source by clicking here.
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