One of the guys just did an experiement on the two hitches. For the $$ value, the Equal-i-zer (IMHO) is the best. That is, unless you want to spend 2-3 thousand $$. I tow a Safari 25 with my 05 Dakota Quad. I've had the sway issue come up when going on I-15 (Palm springs, CA). With all the open range, you get cross-winds and big rig trucks pushing you. The Equal-i-zer does the job of keeping the AS stable. Yes, you do feel a little movement but nothing to get you excited over. Plus, it's easy to hitch up and off.
Read the thread Trailer Sway 101 I posted today.
Take Care and Happy Trails....