Best Sportsbooks for USA Players For handicappers in the United States, there are several online sportsbooks that still welcome us. However, we only recommend books that are financially secure and trustworthy, narrowing it down to two great sites. Our overall favorite online sportsbook is BetOnline.com. For most sports, their lines are posted very early, with a standard vig of 10%. They also offer a lot of props, futures, & live betting as well.