The underdog is way more likely to be my favorite, but that’s such a double-edged sword.
On the one side, it’s so exciting. They’re not the most popular choice, but when they start doing well the surprise that comes with it is amazing. You can say you believed in them from the start and when they eventually rise to the top in the end you’ve grown close to them, seen them go through their hardships and beat the competition when nobody said they could.
On the other side, there’s the thought in the back of your head, nagging, “they aren’t as likely to win”, “it’s true, they’re the underdog for a reason”. You’ll see them break under pressure, perform well but just not well enough and get beat up by the fan favorites. Close, but not close enough. Or worse, not close at all.
And one of those sides is chosen at what might as well be the flip of a coin. All part of the charm, I suppose.