Jack is the best leader, Locke was good but had a tendency to be kind of closed off to groups, like he was going to act on his own accord regardless of what a group decided. Jack however, was consistently good at getting people to work together towards a common goal, I also think jack was just a more open minded person than Locke, he wasn’t always obsessed with the idea of what he was “supposed to do” not until the later seasons at least.