Easiest hitch for us has been the Equalizer hitch. It's a WDH with built in sway control. No separate parts to install or adjust.
Cheapest would be a bolt on friction bar. They work well, are cheap but are separate from the hitch itself. Many require removal when backing up.
Most expensive would be a Hensley or similar type hitch. They move the pivot point forward to the axle which reduces sway similar to how a fifth wheel trailer tows. Rather expensive but they're the best available.