One won't be obsolete, they just have different purposes that overlap a lot. The Magnum is actually lighter I believe, and it is oriented more at powder shredding and jibbing. The regular opus is more versatile, it sacrifices a little bit of pow performance for all mountain performance. Do you live in Japan? Or are you going to tour deep pow? probably go with the magnum. Do you want a pow ski that can rip the whole mountain? go with the regular opus. at least, that's how I read it.