You guys are ruining this thread. Take your argument to NSG or PMs. To the OP: they are quite similar skis, albeit with a few noticeable differences. The opus is softer, has a less distinct taper, has a shorter, more dramatic sidecut, and has a full sidewall. The sidewall won't have a major effect on the way it skis, but the other attributes will make it quicker and more agile at slow speeds, better in the trees, and slightly more playful, although they will also be a bit less stable at speed and in chop. The bent chetler, in turn, is stiffer, with more of a sharknose, a longer radius, and has a step-down sidewall. These will make them a little bit more stable at speed and through crud, but with a slight loss in the agility/playfulness department. The net chetler gets the edge in deep powder with a wider footprint and bigger rocker, while the opus gets the edge on groomers with a tighter radius and narrower footprint and full sidewall. All in all, these differences may seem major, but in a real world enviroent they will be very subtle. Both will float well, do reasonably well in chop, carve well for a fat ski, ski trees well, and spin well. The guys who created them ski together, hitting all the same lines and throwing the same types of tricks with the same style and approach. With skis this similar, I'd probably pick the ones you can get a better deal on, but assuming you can afford either, this post should help.
Cheers,
Isak.