EZ Dock was the winner here. The boat float for rigs up to 3,000 pounds and the convenient PWC port would cover most boaters' needs. We like the dock boxes at the bow that secure gear and offer a convenient step to dock level. Handy fenders keep moored boats from riding up on the dock.
ShoreMaster also has handsome fenders and an awesome PWC hoist. They opt to make floating and winch hoists rather than drive-on models, and those weren't as convenient to install at our location, so we didn't get to test them.
VersaDock's strengths lay in the patented half-cubes with V-entries. These components made it easy to drive on our boats, but in the accessories department we were looking for integrated fenders, benches and storage compartments which VersaDock lacked. On the other hand, the round edges of the cubes would very likely be as easy on a boat hull as a fender.
CanDock's cube system is also cleanly simple without attached fenders or adornments. Every dock had a winch system in place, so we could easily return the jetdrive Sea-Doo Challenger to the water. CanDock invented one for their system the week before arrival, and it can be positioned anywhere on the dock. It will become a normal accessory for their system.
SportPort is decidedly simple in construction; accessories were limited to the winch. However, the system worked so well when used in conjunction with other docks that we think its continued popularity is inevitable.