a roller trailer does not have to be backed nearly as far into the water, you can keep the rims and hubs dry by not having to back down the ramp nearly as far, and using the winch to pull the boat on the trailer. A bunk usually supports the boat better, but you can pretty much match that with more rollers/ bunk style multi roller beds. but for a boat as small and light as a sneak, you can pretty much winch onto a bunk trailor the same way, but launching may be more of an issue. its really personal preferance, or the depth/steepness of local ramps