The crucial difference between sports betting and casino games is that no knowledge of slot machines or the roulette table allows you to always be in front of the house unless you are some kind of talented sage, and as soon as the casino realizes. you are, they forbid you anyway. But with sports betting, you can bring all your knowledge about the game, the teams and the players together to make informed and calculated bets and therefore potentially win a significant amount. For example, thousands of people around the world could win big money at the World Cup this year.
While in a casino there are fixed rules for Sports betting, many sports books will accompany you to bet on just about anything. In roulette, you can only bet on the numbers or the color the ball balls on, not how many times the ball e.g. Goes around the wheel. With a football match you can bet on the final result, the half-time result, who will score the first touchdown, etc. There are even a number of more outlandish suggested bets you can make, like how many times the head coach will throw his hands in the air in desperation. If you can bet, there is probably someone who is willing to take your bet.
You can also adjust your bets during the game, taking into account the action that has already taken place. Of course, the odds change accordingly, but the opportunity is available to you. Once the ball has entered the wheel at the roulette table, you cannot change your bets.
One last difference is that you can place sports bets remotely. You can watch the game at home while placing bets over the Internet. This is illegal when it comes to casinos. You must be physically on the casino property to be able to place anything.