to be honest i usually dont play on betting websites though if i want to make a bet i usually choose to go with directbet.eu or anonibet
besides that you should google about the sportsbooks websites before making a bet because you should search for the best odds
Actually their odds are not having so much different though if they make too much different people dont want to play at their site anymore and it will make them hard to compete with other sites. May be some odds is different around 0.05-0.1, AFAIK it never go higher than 0.1