No speederbike will ever be as good as the landspeeder or even the Flashspeeder. The floating wheel action is so slick compared to the "manual action" needed to play with the bikes. Plus you can do the old crash and bash with the speeders and pop open the hoods when they make impact. Besides that the speeders can hold more figures than the bikes.
Yes, the bikes may be good for diorama building, but as for the actual toy appearance and playability there's no comparison. Luke's speeder all the way.