If you ask yourself, where is it cheaper to buy a Best Used Car in Delhi, in an agency or in a batch? I can tell you that it depends a lot on the model and mileage the vehicle has, but on average the price is very similar due to the commissions of the sellers.
In the case of buying a used car with an individual, it will depend a lot on the luck of finding a good offer. Prices can increase too much if you do not know how to negotiate, but if you run with luck, you can find an acquaintance who only asks for the real price of the vehicle.
When buying a best used car from a private individual, you must also take care of the legal procedure and mechanical checks. This will force you to spend more time in the process.