Playing with friends is much better they can tell you when to chill out.
Or be there for support or just talk to you while you play.
I rather to gamble alone and if I'm with my friends I mostly prefer to be there to support them and talk to them and give some advise while they are playing. But if I do gamble and they are the ones who will do what I prefer to do, then I won't listen to them for I don't think they are good advisers either.
depending on the nature of the people some people prefer to play gambling alone as they do not want to disclose himself to his family or friends that he play gambling, while some people do not care for that and they always enjoy gambling more when they play it with friends in groups. to me i like to play gambling in a company of my friends as there is more fun in gambling while playing it in groups with friends.