It really depends on what you are attempting to get out of them. The LINE Invader is a fully symmetrical ski and is a great option for somebody that is looking for a "park specific" ski. OTH the Trouble series by Dynastar revolves around the ideal of having a ski that can go anywhere on the mountain and in turn is what I would consider an "all mountain twin".
IMO it will really come down to what you want to do....If you are looking for a park specific ski and have a second ski go with the Invader. If you want one ski to do everything, go with the Trouble.