I like competition when it's just a harmless game between consenting people who can cope with losing if it turns out that they do lose, but otherwise I don't. I'm much more in my element in "real life" when I'm co-operating, and when my group gets competitive, I see it as a sign that something's gone wrong. I'm prepared to compete against people who out of greed, malice or plain disregard for me threaten my well-being (enemies) if there's no other way, and if they're a severe threat to me then I'll take some pleasure in rubbing their noses in it good and proper, but I'd rather just keep them out of my life and spend my time with co-operators and helpful, supportive people. It makes no sense to me that a group of people should pit their energies against each other when they could co-operate, which is obviously much more efficient - two equal and opposite forces achieve nothing. But if it's a harmless game for sheer fun, or for the players to sharpen their skills by giving each other some back-pressure, that's fine.
I do tend to feel competitive when I perform music and others are also performing as separate acts - part of me wants to go down better than they do, but I don't like myself for feeling that. In terms of what I do, it makes no difference though. I wouldn't try to nobble the competition or deliberately find out their weaknesses and perform something that surpasses them in that regard in order to highlight their weak spots and create the illusion that I'm better than they are, I just try to sound as good as possible. And I don't absolutely hate it when they go down better than I do - there's always a slight feeling of "you bastard," but I don't do any harm with it, and it doesn't define my overall feelings about them. Music is also a game, money isn't usually at stake at my level of the pursuit, so competitiveness isn't so terrible, but I prefer it when the overarching ethos is for everybody to do what they can to make a great show.