Welcome Squidman!
Remember, Fender is emphatically [b]not[/b] the only make of bass you can look at. And, the choice is far wider than between P or J (as generic types of bass). I would suggest you find a nice music store in your German town or its vicinity (if you happen to live anywhere near Thomann or Warwick, I [b]sooo[/b] envy you!!), and look at, and play, and listen to as many models of bass you can get you hands on. Doesn't matter whether you can actually play one or not, you can ask the guys at the store for help. Do it! Have fun!