Car purchase: dealer vs. private

Hello, experts, I’m quite inexperienced with the car purchase and therefore I would like to ask you for your advice. I have a “BMW 316” to buy and have been watching the offers for weeks. In this context, I would like to know where you are on the safer side, with the private seller or the dealer? Are there advantages for me when I buy from the dealer? If so, which one? A disadvantage is already known to me. The higher price. and take guarantee in Kuaf. Thank you