The guy who makes the winderness access used to work and design for watermaster. I think the waterstrider is also affiliated in some way to the makers of watermaster.
For my money I would stick with watermaster as they have been in business the longest. You want to look at the bruin package which is the lightest and should be great for new england waters. I own a grizzly and it is not something I would pack for overnighters unless it was a short hike.