This is a comprehensive study of the our recommended bookmakers with the best odds / lowest margins. The list comprises of Bet365, Betfair, Bodoglife, Bookmaker.com, Ladbrokes, PinnacleSports, Sportingbet. They are ranked by sports.

The list of Sports ranked below:

1. Soccer - English EPL /FA Cup/ First Div - 500 recent matches (2007-2008)
2. Soccer - Europe La Liga / Serie A / Ligue 1 / UEFA -  500 recent matches (2007-2008)
3. Baseball MLB / NCAA - 500 recent matches (2006-2008)
4. Football NFL / NCAA / AFL - 500 recent matches (2006-2008) 
5. Basketball NBA / WNBA - 500 recent marches (2007-2008) 
6. Horseracing Royal Ascot - 100 recent races (2007-2008)

Soccer Conclusion: The top 3 performers for Soccer are 1st: PinnacleSports, 2nd: Bet365, 3rd: Betfair. So if  you're really into betting soccer and want the best value, sign up for all 3! However, if you want to avoid the hassle, choose either PinnacleSports or Bet365.

Baseball, Football and Basketball Conclusion: Bookmaker.com & Bodog consistently rank better in terms of these 3 sports - basketball, football and baseball. It comes as little surprise these 2 bookmakers specifically target their cliente from the USA. So if you bet on any of these traditionally American sports, Sign up for both Bodoglife here and Bookmaker here to take advantage of the BEST odds around.

Horseracing Conclusion: Horse racing is not as straight forward as soccer or the traditionally american sports. However, from the graph we can see, we would recommend the top 3, as this would still account for 62% of the total best odds. Decent enough. Sign up for Sportingbet.com, Ladbrokes here, Bet365 here.