I actually have both: Equalizer on my enclosed car trailer and a Reese Dual Cam (Strait Line to be exact) on my 34' travel trailer. I installed both of them myself. My thoughts:
The Equalizer is much easier to install than the Dual Cam. The Equalizer is a bolt together system, so it doesn't require drilling into the trailer tongue. My car trailer is a custom built, all aluminum, and I didn't want to drill holes in the aluminum tongue if I could avoid it. With the Dual Cam, you need a large drill bit, larger than you probably have at home, to drill into your trailer tongue. I also recommend against using a cordless drill because it won't have enough power. Pneumatic or plug in drill will make your life a lot easier.
The Equalizer is also easier to adjust on initial installation. The Dual Cam requires that the cams be exactly in the center of the bar indents, which take a bit of trial and error using a very large wrench. However, once you get past the adjustment required for initial installation, both systems are equally easy to use when connecting your RV/trailer.
The Equalizer can squeak when turning, but, as the instructions say, just apply a thin coat of axle grease and the noise goes away. I have found that the Dual Cam makes a lot more noise, and I also lubricate that one per the manufacturer's instructions. From a noise standpoint, the Equalizer is better.
As for sway control, it's tough to say which is better because I haven't had issues with sway on either my car trailer or TT. Actually, the only time I had problems with sway was when my car trailer had too little tongue weight, but that was user error and not because of the Equalizer.
I went with a Dual Cam on my TT because I have a 1,500 pound tongue weight, and the Equalizer only goes to 1,400 pounds. Reese has a 1,700 pound dual cam model.
2013 F250 CC 4x4 Diesel
2014 Open Range Roamer Travel Trailer RT316RLS