As of April 27th 2015, the #1 rated sports betting system is "Soccer Underdog Trend."
I would also state that this system is currently at the top of the chart simply because it demands a larger betting size per unit which is $500. That means a larger profit because of the bets's larger size.
If you're just getting started in sports betting, $500 per unit may be to large, but the good thing is you can still follow this system picks with much smaller betting size.
Nothing stops you from betting $10 for each game instead of the required $500. There's even an option on each system page which ask you to set up your unit size per bet based on how big your bankroll will be.
So if you indeed decide to take this system's generated sports pick with much smaller betting size, you should of course NOT expect to make the amount of money that is posted on the chart above since these numbers are based on betting $500 per unit. You will STILL make a profit but much smaller which would be fine with the majority.