I don't think that there is any sport that can give you guaranteed success each and every time but somehow I feel that betting on cricket is much easier for me to make some money as you can easily predict what will be the end result depending on the teams and if you have good knowledge then it will become more easier for you to win in it.
in my opinion, if someone is familiar with one sport, he know almost everything with the sport and each of team, then i think if he place a bet then he can have a chance to win every game he bets. but i agree with you that this is not always guarantee to him to win because this is about a luck in each of team that played in a match. we have 90% prediction to win but 10% we have to depend with the luck from the team or a player.