Mile High, read what lanerd posted. I think he really hit many points.
The way I look at it, there are 4 types of hitches,
1. the ball, nothing else
2. a weight distributing hitch that you can add a friction sway bar to
3. an integrated hitch with built in wd and sway features.
4. the pro pride and hensley type of hitch that use a completely different style of engineering to accomplish anti sway and wd
Personally I would avoid types 1 and 2. I have an Equalizer and am happy with it. You will have to decide if you want a friction type (like the Equalizer, E2 or Reese Trunion) or a mechanical type that uses chains, cams and other things. I like the Equalizer for the end results but also it is easy for me to hook and unhook and I can do it on uneven ground. When I look at the E2 and the Reese Trunion it looks like they are copies of the Equalizer.
There is a newer hitch out there. The Anderson gets good reviews from owners and I understand that it is much lighter and easier to use. You might want to look into these too.