I think this sentence right here isn't a challenge. One rule in sport betting is never to bet in favour of your favourite team. Sport betting should be done based on analytics.
Roulette on the other hand is a good game to gamble on, only with strategy. It's mostly based on luck. It's hard to win roulette at times. Because it either involves dice, numbers, colours.
I think of the two types of games that are in the gambling place I prefer to guess sports matches because it makes more sense while for roulette it is very difficult to predict and of course has a higher risk than sports betting.