When the boys decide to have a vote to create the post of leader it is clear that there are two main contenders: Jack and Ralph. Jack has already been shown as being the leader of his troop of choristers, leading them in file formation to the meeting, and his arrogance is clearly shown when he tells the others why he should be chief:
"I ought to be chief," said Jack with simple arrogance, "because I'm chapter chorister and head boy. I can sing C sharp."
It is interesting that the qualities that Jack feels would make him a good chief are the qualities that make him a leader in the civilised world: qualities that the rest of the novel will quickly show to be useless on this island. However, the boys notice that there was a stillness about Ralph, in addition to his attractive appearance and size, and lastly, the conch seems to have exerted a fascination, all which served to cause the majority of the boys to vote for Ralph. However, interestingly, we are told that although all the boys who aren't in the choir vote for Ralph directly, Piggy delays his vote:
Every hand outside the choir except Piggy's was raised immediately. Then Piggy, too, raised his hand grudgingly into the air.
It appears that, despite the time they have had together at the beginning of the novel before the meeting, Piggy perhaps feels that because of his intelligence he might be a better leader. However, we can see that he bows to public pressure and votes for Ralph.