It totally depends on your style of skiing. If you are just a beginner however, then don't get either of these skis, the halo 2s are relatively hard to handle because of their shape and flex, but J skis will be more traditional and might not actually be what you want. These are two completely different skis, and it's kind of weird that you would pair them together, most people will look for similar skis, and then ask this kind of question.
Jskis are a medium flex ski, and have very close flex pattern in the tip and tail. And they are a very good all mountain park ski for a pretty good price.
Halo 2s are fairly soft skis, the tips are crazy soft and flex like crazy, but are still amazingly stable while doing so. The halo 2s tails are stiff compared to the tails (but they are still softish) and that is to make the skis have a longer life span, to make them pop like crazy, and to be more stable. They also have a really weird shape (which I mentioned before), and they are hard to get used to. So if you really love doing nose blocks, nose butters/presses, and want a ski that is mainly park oriented, then I would recommend halo 2s to you, but not knowing how you like to ski I would recommend Jskis.
I've only rode the halos once, and bought Jski's this year which I've only rode once as well. The Jski's are a lot stiffer and more stiff. But when I was a beginner I remember liking a softer ski, it just made everything easier. But for the money buy the Js. I don't think you will be disappointed
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