Can't speak from personal experience but according to their stats, they're both well rounded all mountain boards. Both rocker in the mid, same flex, both have an icy condition side tech. Probably splitting hairs and comes down to the paint job you prefer.
If I had to go based on what people say online, I've heard SL is freeride biased, and very stable. The equivalent of SL in the Lib Tech line would probably be Banana Magic.