Both comes to play because critically looking at the topic you will understand that winning in gambling can't be differentiated from luck and chance the both are connected as luck and chance goes together luck because gambling is one thing that is difficult to predict even though sometimes we try to predict due to the performance of a team based on current form but still yet that is not a guarantee that the team will deliver.
Chance also play a role because someone mostly on on slots games you may be chanced to win as the games are programmed which most people call luck but actually the game is structured in such a way that everyone playing have equal chances of winning