I've tried several...the best two that I have experience with are Danner pronghorn snake boots...a little bit heavy, but waterproof, and super comfortable. I haven't found any snake boots as comfortable as those were. Sadly, they got left outside, and my lovely bulldog was able to chew a sole off of them after I used them for 3.5 years. I'm sure I would still be using them if it weren't for that.
My second recommendation, and I dont believe they are in production any more, are the Cabela's snake boots with the boa tightening system. They are comfortable (not as comfortable as the Danners), and super quick on and off. I haven't had any problems with them leaking. I like them. Lighter than the Danners, as well, so for those days when several miles are being logged, they are nice.