I would say Lib TRS with Flows.
Gnu bindings have not had the best reviews and the NS Heritage, while a great board, may be a little too stiff/freeride focused for you. The LibTech magnatraction has the best grip on ice IMO, better than NS especially once the edges lose their new sharpness. The TRS is a bit more flexible but still damp and more forgiving, which will make weaving in and out of moguls/trees a bit easier than the NS Heritage. NS boards are certainly more durable, but if you aren't getting crazy in the park/trees, this shouldn't be an issue. Just remember to tell those damn skiers to keep their skis/poles off your board. I think every ding in my Lib board's topsheet is caused by a skier slamming their edge on top of my board on the lift!