Bunion correctors are hypothetically one way in which you can fix a bunion. The research evidence is that they can improve the deviation of the large toe several degrees after several months of use. The clinical experience with them is that they can be quite effective at helping some of the symptoms from inside the joint and keeping the joint mobile and flexible.
So, which one is the best? All of the bunion correctors probably achieve the same thing, so there is probably not one that is better than another. it is a matter of using one that best suits you.
Clinically, I recommend this bunion corrector at its simple and reasonably priced for use at night and the Bunion Assassin for use during the day. This Bunion Assassin is a good idea as it helps maintain some of the correction from the overnight use of the bunion corrector that your shoes are going to try and reverse.