Well, that's a tough one.
If they didn't change the prices/TS credits, I'd pick breakfast hands down. I love getting into MK early for breakfast and enjoying the park with minimal crowds. I've got some great photos with just my girls in front of the castle.
But since they raised the prices, I don't think the breakfast is worth 2 TS credits! You would get more for your money at lunch I guess.
So I would either pay OOP for breakfast or just bite the bullet and pay an arm and a leg for breakfast.
Of course, having done it several times before the changes, we won't be eating there again but its worth it to try it once, as in once in a lifetime experience.