I believe most of the posters here will be rooting for Donaire, but it would still be nice to put up a poll to determine who has the majority of the votes.
If Donaire is listed as the favorite, I doubt he will be a heavy favorite. He's coming off a big loss against Inoue, so he doesn't have much momentum, unlike Santiago, who is currently on a winning streak.
Donaire is still a top class fighter albeit his age. A lot of people are discounting him due to his age but his experience in the ring still matters. He put up a good fight against Inoue albeit his loss, and Santiago's record isn't that promising either. Overall, bookies would really favor that who has his career already proven to the world and is still going at it despite his age. Donaire may have slowed down, but he still knows how to use every aspect of boxing at his disposal.
For the odds, I believe, Donaire will also be the favorite here despite his age.
It is good that they found another boxer to fight for this belt.
The sooner the better, as he needs to finish what he wants to finish before he hang his gloves.
He still has something to give to his fans, hence, he keeps on fighting.