I use all Bet Rivers, Fan Duel and Draft Kings since they can have different odds and sometimes cool promotions (like getting the Chiefs for a spread of +101 points for Thursday with a max bet up to 50, payout of 95 so a no-brainer bet really). One of the sites had a run line of +45 for the Sox last week and I think the Lakers at +101 as well, paying out 95. So I look at all 3 apps after deciding what bets I want to make to check the odds.