I like HG93 chains. If you're running Shimano, you should always carry spare pins, if not for you, for someone else. And a quicklink. If you're really cool, you'll have both 9 and 10 speed quicklinks. They don't weigh anything. I've fixed Shimano chains by just reusing the pressed out pin. That's gotten people home so far. KMC chains don't seem that great.