I fly ARCs on land and water and fly them amongst other blimp riders on the water. I would say the size foil you use is roughly similar to the inflatable in power, unless you use a bridled foil. The ARCs have no bridle (you can see the photos at the site) so it has a projected wind calculation to figure out the power much like a blimp. A bridled foil uses the bridle to hold its shape more open to the wind, so it generates more power for its size (due to more wind).
Pros: more power, sits back in the window more for land riding where its usually more gusty
Cons: bridles can get messy, can't fly as far to the edge to get more upwind, not as fast turning
Pros and cons of inflatables vs foils on land:
Foils are more durable and usually cheaper. They have more control. With an ARC, you can fly the kite backwards, so if you're tired, you just back it down to the ground and rest, then relaunch easily. Relaunch on snow for a blimp is pretty much impossible. Cold hands do not like pumping bladders. Setup is much longer for an inflatable so you don't get as much riding time. Inflatable self launch on land is not easy. I can go on and on...