I'm expecting a TSM win 3-2. TSM will come out slightly behind in the early game for the majority of the games maybe except 1 game where they may come out ahead. It has been this way with TSM forever, they are a comeback team that wins in teamfights. Overall both TSM and C9 players are about equal if you compare every lane head to head.
Top: Balls is known as a better "carry" top laner and Dyrus is known as the guy who gets killed non stop early game but in the end Dyrus does NOT try to carry, and by late game he is always a meat shield for his team and that is exactly what TSM needs. The difference here is while Balls can stomp a game every once in a while, Dyrus cannot be taken out of the game while Balls can.
Jungle: Comparing this season alone, Santorin could be considered equal to Meteos, the only difference here is Meteos has an edge in experience but the overall difference this will make wont be too big if Santorin plays the same way he has been all split.
Mid: Bjergsen wins in most aspects honestly, but Hai is underrated and is a better mesh with his team in a teamfight while Bjergsen is an outlier in TSM's teamfight but manages to make the plays.
Bot Lane: About equal overall. WildTurtle and Lust are more likely to make a mistake, and Sneaky is a better laner than WildTurtle. But LustBoy is better than Lemon once outside of the lane. Turtle's average play skill is lower than Sneaky's but Turtle max potential play skill is higher than Sneaky's. He is essentially High risk, High reward while Sneaky is more of consistently pretty good.
But it will all come down to the Teamfight, and TSM is the best Teamfight team in the LCS by a mile. They are the only team consistently doubted because of their average early game and slow closing but they are the only team who manages to dominate like that. They can be down 3-5k gold and still pull off those Teamfight wins that no one else in the west can do. A very underdog style but very effective.