Preamp or pickups first?

So I have a cool project bass with fairly weak pickups and mediocre active preamp. I have two other passive basses, this is my only active one, and I have put better pickups in both of the passive ones. The difference was absolutely noticeable and they both became way better with new pickups. But this active bass, should I try a different preamp before new pickups or should I try new pickups and the old preamp first? It’s a Dean Razor btw