It depends on what you like and what else you have got. Similar to you I got a Nautilus from the AD in 2018 - in my case a 5711 blue. My only other Patek is a platinum Calatrava. The thing is that I'd rather keep one sports Patek and one dress Patek than lose the 5711 for a second dress Patek no matter how desirable the 5170P may be. If the Nautilus was my only Patek I'd still not trade it towards a 5170P as I'd lose a lot in terms of versatility. If anything I'd add a 5170P but so far I managed to convince myself it is just an itch rather than a must have.