Sway bar options - totally befuddled

I've never had to mess with a sway bar before. I get their importance, but I'm confused over options. The Equ-i-lizer seems to be a very popular option, and it's sold locally for $600 - $700. The people who are selling us the trailer have offered to sell us their sway bar set up - a Curt Trunnion Weight Distribution Trailer Hitch 17302 - for $300 (about the cost of a new one).

The price differential is huge, and both of them receive positive comments from respective users. So what's the difference? Obviously, my inclination is to go with the cheaper option, unless there's something vital that the Equ-i-lizer offers that the Curt doesn't.

Any ideas? Is one far superior to the other to warrant this big of a price difference?

Go with Blue Ox or Reese. I have an Equalizer and would not purchase another one. Why not try the Curt before you drop coin in a new hitch. You might want to get a sway bar or two but they are inexpensive. That is a lot of trailer for a three quarter ton Suburban. Check the receiver to be sure it can handle the tongue weight and do not use dry tongue weights. You might want to upgrade the receiver to handle the 1200-1300 pounds of tongue weight that will likely be the norm for your towing. Use gross trailer weight and multiply by .13 to get a good idea of what the real tongue weights will be or go to the scales. You may also need some supsension mods to the burb especially if it will be fully loaded with kids, dogs, stuff.......