THE WORLD CHAMPION
See sportsbookreview.com, that is the the leading sportsbooke review monitor.
They even have a warning list to warn you which sports books to stay away from, and they also list all the books that have had problems in the past. They rate hundreds of books all over the world.
They are honest, free, and represent the players not the books. A sportsbook cannot buy their way on the list. They can only earn their way on it.
They are very picky for who's on the list. Out of all the hundreds of books they rate on a regular basis, there might be maybe 8 books or fewer on that reccommend list.