The FanDuel Casino welcome offer gives new players a $40 casino bonus and 500 bonus spins for slot games. ​​ ​​FanDuel vs. BetMGM: Best real money online casino promosThe best real money online casinos all offer sign-up bonuses for new players that award benefits like casino bonuses, bonus spins and loyalty rewards. The below table summarizes the FanDuel Casino welcome offer and the BetMGM Casino welcome offer. Then when you make that deposit, BetMGM Casino will give you a casino bonus equal to the amount of your deposit, up to a $1,000 maximum. In a comparison of FanDuel Casino vs. BetMGM Casino, FanDuel has the best online casino sign-up bonus.