I like the experienced character more because I can define and create the character I want.
With a rookie, they can sometimes seem like idiots who should have chosen a different career. Rookies also have a tendency to be ignored or railroaded because they don’t have enough influence to make their own decisions, or a rookie game is more about completing a task instead of creating a character.
Look at Choice of Romance. You are young and inexperienced and the only way to “win” (or at least get a sequel) is to pursue some unfaitful monarch, who your character may not even like or trust.
Guenivive does a similar thing where you are forced to marry an idiot king, and are powerless to stop it. The idiot King likes to rub this in your face by stating that he could have stopped the wedding while we were powerless to do so. The guards even say they can’t refuse an order from the king, but they can readily refuse your order to stop following you. And , worst of all, the idiot king pretends he wants to work on the relataionship, but he never listens to you when you say you want to be involved in politics and he makes the decision to bring sheep in the castle and is too selfish to remove them at his wife’s request as a good will gesture to aid their failing marriage.
Awoken has both, but I enjoy the experienced MC more. The experienced MC has the power to order peoples’ deaths, if they want, and it shows the MC’s character by how they respond to situations. Rookie MC is forced to follow a stranger, even if MC doesn’t trust the stranger, because the stranger is the only one who can help them.
Although, I do like a young rookie MC like in Alter Ego, Carthallow, and Dragoneer, or a spunky new adventurer not bound by anyone’s rules who goes on a quest and picks up new group members on the way.I would probably still play a game a rookie MC.