An e-mail extractor qualifies as being the best based on the speed on which is extracting the e-mail addresses, robots, filters and the technology used to perform these queries.
In my opinion I can't establish a single product which can be called the best and instead I can advise you to browse the results of this search query and manually test the e-mail extractors displayed.
After some testing you will figure it all by yourself which one to use for your needs.
