First off not to be an asshole but this thread technically belongs in Gear Talk. Which you can find on the top bar under forums. Or I can link it here -> http://www.newschoolers.com/ns/forums/forumthreads/cat_id/25/
Now to answer your question:
I have skied both these skis, I will say that the thall is great for the full camber more stiff effect. If you plan on stomping huge jumps and that will be the only thing you do with maybe a rail or two here or there I will say go for it.
However, ON3P FR's are the shit. The reason being is because they have a great all around feel when it comes to the terrain park without sacrificing the ability to do something extremely well. If you want to throw down in the jumps and slay some rails you can do it. The core is responsive enough to not be super noodily and still kick ass and not feel like you are skiing on a stiff piece of wood (bamboo core!) and if you are like myself, the added benefit of having rockered tip and tail makes it great for carving a little fresh and crud here and there.
In addition to that the longevity of the ski is massively in the favor of ON3P because of their meatier edges and bombproof cores. All in all the Filthy Rich is a superior ski in my books. And in the long run you'll get more life using the Filthy Rich anyways.
Hit me up if you have any other questions I've tested a few skis in these past couple of seasons and I have no problem answering gear talk questions.
On a scale of 1 to Simon Dumont how mad are you?
Check out Vunder Sports Network: The next big thing in action sports streaming! http://vundersports.com/