1066: Who had the best claim?

Duke William has the best claim to be King because he has more evidence to be king than the other people. The evidence that Duke William had was the support from the Pope, Edward the Confessor who promised to name him as his successor, and Harold Godwinson agreed to help him become King of England but he betrayed Duke William. Nobody except for Duke William has a famous person supporting him like the Pope and lot's of people would support Duke William because if the Pope agrees to help Duke, then lot's of people will follow him. Although Harold Godwinson is a strong English leader approved by the Witan, he was an "oath-breaker" which makes him not trustworthy. Harald Hardrada was a powerful king with a large army and had support of Tostig, Harold Godwinson's brother and that his ancestors ruled England but just because his ancestors ruled England doesn't mean that he get's to lead England at 1066.  So by judging all the reasons from the three men, I would be think that Duke William has the best claim to be the king of England.