According to me, Sports betting is most profitable. In some matches the odds might be small yet the chances of winning the bet are very high. Now what matters would be the amount of your stake, also there different markets to choose from and you can place parlay/accumulator market whereby with a small stake one can win huge amounts, yet the chances of winning the bet are small. Even though there are small , with research and analysis the chances of winning can be increased and minimize risk.