JJs are floppy noodles compared to the chetlers, Opus is more versatile yes but thats only because it is skinnier in the waist. Only problem with JJs and Opus is that the Opus only comes in a 185 and the longest JJ is 195, and 195 is too long for my height but 185 is too short imo. Also Armada copped out on the AK JJ by just increasing all dims by 5mm, the 195 doesn't ski like the 185 at all really, not as nimble. The 192 Chet is definitely a very solid choice, and performs better in power.
Also the Opus has been said to perform way better than the JJ in powder, has less exaggerated rocker but still has more float.
