It is difficult to point at one basement waterproofing method and say it is the best. There are many different methods for waterproofing basements, and some will work better than others on different basements. Part of that depends on why water is coming into the basement and how the basement was built. Generally, the best method of waterproofing your basement is to combine different ways. The contractor you hired to help you with your basement should be able to give you some suggestions as to what you should try.