I have the T-hall's but I don't have the J.O. They are both great park skis. The t-hall will be better for rails and will go well for small jumps. The J.O Pro's are stiff so I don't know haw they will do for rails cause I already try the one's of my friend but they were way to short for me cause I don't know. But for jumps they will go great and they are stiff so you can land sw without any probleme.The t-hall's go great for jumps but if you are doing a big jump and landing sw try not to land to forwars cause they are really soft.
So all in all they are both great park skis so if you want a softer ski go with the t-hall and if you want a stiffer ski go with the J.O. Pro's.