Two completely different cars wear this badge depending on when it was built. The 2009-2012 models burn oil from flawed piston rings, an expensive fix that makes those years a hard pass. But the current B9 generation (2017+) is genuinely reliable if you maintain it properly, which means premium fuel, timely oil changes, and no skipped service intervals. This isn't a Camry you can neglect. New pricing at $52k for a base model is laughable, but a 2-3 year old Premium Plus with ventilated seats around $34k is where the A4 makes sense: refined interior, Quattro that actually works in snow, and 40+ mpg highway. Buy it used, maintain it religiously, or skip it entirely.
The Sentra is Nissan's bet that you'll trade long-term confidence for $5,000 in your pocket today, and honestly, it's not a terrible wager if you know the terms. The current generation looks sharp, rides comfortably, and delivers 40+ mpg, but the CVT's catastrophic 2014-2019 failure history casts a long shadow even though the redesigned unit seems genuinely improved. The 149hp engine wheezes on highway merges, and oil changes require removing 28 belly-pan fasteners with no access door, turning routine maintenance into an expensive ordeal. Buy it if the price gap matters more than resale value and you'll commit to 30k-mile CVT fluid changes; walk if you need a car you can confidently drive past 100k miles without a transmission fund.