Are you referring to the SX version of the SLX, or the race-stock, flat (no metal prong) version of the Elan? The SX is still a vertical sidewall, race construction ski, but with different flex than the SLX (SX is stiffer, and it has a dampening prong under the topsheet). The SLX is a superb ski, and I could do anything on it when I owned a pair. They were quite easy to ski, lots of rebound, stability in any size arc. I even ran GS on a pair of 155's! The SX was a little stiffer and more damp. A powerful ski, not as much rebound, and a wicked carving and stable ski at high speeds. The Fischer WC SL was much the same, although a little stiffer yet. I liked the Elan's a little better than the Fischers for myself, but I am not heavy (150lbs). I get the feeling that the Fischers are tailored to the heavier person, with the Elans being for the lighter skier. I doubt you could go wrong with either. I haven't skied the Atomic, so I can't comment there. If you are strictly freeskiing, you may also want to glance at the Elan RIPstick in 164 or 170. I have been freeskiing that the past few days, and, I really think it is the best racecarver I have yet been on (I have tried out about every ski in the category). It more or less combines the stability of a GS with the quickness and rebound of a slalom in one package. All of the other racecarvers seem to be either GS or slalom oriented, and don't do a good job of blending the best attributes of each-they are either GS or SL in feel. The RIPstick is really, really fun as a go-fast freeski for any type of frontside snow and turn radius.