Trade-in or sell privately?
There are pros and cons, whichever way you decide to sell your old car. If you choose to sell privately, you may get a higher price than a dealer will pay, but you may have to wait some time before you find a buyer. This can be quite costly as you could end up with two cars on your hands for some time.
It's also very inconvenient if you need to put the money from the sale towards your new car, or if the buyer wants to take possession before your new car is ready, leaving you with no means of transport.
If you choose trading in you will know exactly where you stand financially when you agree on the trade-in price.
You won't have the hassle or expense of finding a buyer for your old car and once the deal is done, you can effectively drive off in your new car, leaving the old one behind.