Both have merit depending on your budget and priorities.
Buying new gives you the latest range and technology, full manufacturer warranty, and any remaining incentive eligibility. It also means you know the full history of the battery.
Buying used can offer significant savings. A 2–3 year old EV often has most of its range intact (batteries degrade slowly) and may be available at a substantial discount. Key things to check when buying used: request a battery health report if available, check the remaining warranty, and review the charging history.
The used EV market has grown significantly and offers good value, particularly for mainstream models like the Tesla Model 3, Nissan Leaf, and Chevrolet Bolt.