The best thing about the Anthems and Invaders is that the skis have actual design features made specifically for park skiing. Line did not just make a ski and call it a park ski (like most companies do) line made a park ski from the ground up.
For one, the ski is supposed to be  center mounted.. so, in return they will ski way better then if you are trying to center mount a ski thats supposed to be like 5cm back. The ski is 100% symmetrical so, you can ride switch just as well as forward.
With the Butter zones and the carbon fiber that means better presses, ollies, nollies, buttering, and whatever else you can invent.
 Bottom line is if you want a pure park ski, want to mess around and have a really fun ski  I highly recommend getting the anthem or invader