Better new or with AHK?

Hello together, we just have two (almost) identical SEAT Arona in mind. The difference is that one vehicle has a trailer coupling and 1 year old is with 9.700 km. The other is a day registration with 30 km but without AHK. (6 months old) Price and all other extras are identical. We actually need a trailer coupling again and again, but have one on our camper, which we currently also use. (Mal for a trailer or bicycle carrier) that could be na more skillful would be sometimes a smaller vehicle or if you would want to transport the wheels here in the area. (But that would of course also go with the RV.) What would you decide to do?