A difficult question and is really a personal choice that comes down to balance the pros and cons of new versus used.
In the case of a new vehicle is has never been owned or driven before and comes with a full manufacturers warranty (3 to 7 years). A new vehicle has the latest in safety features and the creature comforts. The costs of servicing and maintaining the vehicle are normally lower than a used vehicle. The downside is that it is a more expensive vehicle than a used one and so the repayment will be higher.
A used vehicle is cheaper to buy and finance but may not have a manufacturer warranty and the costs to keep the vehicle serviced and maintained is likely to be higher than a new car. If you want to choose a used vehicle we would suggest a near new vehicle with low kilometres.