My favorites are Luis Antonio Tagle and Pierbattista Pizzaballa. However, I don't want to bet any money on this. It seems weird to gamble with religious matters(even though I'm not the most religious person in the world). Trying to predict who is going to become the next Pope is extremely difficult. In the history of the Roman catholic church, there were many times, when the most unexpected candidate got elected as a Pope.
It does not matter who my preferred candidate is for the next Pope, it seems weird to me to bet "gamble" on who occupies the sacred position, I think that it is not proper. I can understand about the innovation in gambling to vote for who emerges as a winner in political elections but betting on a religious and spiritual selections is not proper for me. I hope that some bettors won't see the process as rigged if their preferred candidate don't emerge as the "winner" because it is not a political election, that is the reason why it is not supposed to be put up for gambling.