The Elantra is a compact that split its reputation clean in half at 2021, before that line, you're shopping engines that seize and cars thieves steal with USB cables; after it, you're getting a genuinely competitive sedan with sharp looks and a warranty that backs the turnaround. The 2021-up cars deliver on value and the hybrid hits 40+ mpg without trying, but pre-2021 models carry catastrophic engine failure risk (Theta II bearing seizures, oil consumption) and the 2017-2021s remain theft-prone even post-recall. Buy 2021 or newer if the price works and you want modern features without the baggage; anything older is a gamble best left to someone else.
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.