People play poker or mahjong with other people eventually leading to friendships.
Your fellow gamblers might become your friends, or enemies.
I don't entirely prefer one over the other because I love both, although it depends on the mood and the games. When I play poker, I'd rather play it with friends than alone with strangers. But when I want to kill time playing dice or baccarat, I'm mostly alone.
I think the general rule is that when gambling outside, may it be in a casino or in a cockfighting arena or betting on an actual game live, I enjoy it with friends. I don't go out gambling all alone. I won't enjoy it.