I think what it comes down to is Honda vs Alonso. That sounds stranger than it is. Jenson has worked with Honda before, and there is a good chance that with Honda coming to McLaren, it could be a vital step towards McLaren being back on top. But on the other hand, he may not necessarily get the challenge of a Champion team mate.
At Ferrari, Button would have to go up against double World Champion, Fernando Alonso. Everyone said he was crazy to go to Hamilton’s team, but he did well there. By going to a new team, which is said to be someone else’s, pitting himself up against one of the best on the grid, he doesn’t have much to lose. Not to mention there is a good chance that Ferrari will make a very good engine. It would just be sad if they didn’t, given how much Montezemolo has been ranting on about engine development. On the subject of Montezemolo, someone like JB would be ideal for Ferrari, surely? He is vastly experienced, he is a team player (Even this year, he has been loyal to McLaren, and not become frustrated) and despite him being a World Champion, his relaxed nature doesn’t create those same rivalries, which Ferrari probably try to avoid with their “Only one number one driver” policy.
Let’s face it, Jenson isn’t getting any younger, and how many chances do you get to drive for Ferrari? In recent years, they haven’t really fared any worse than McLaren, bar 2011, and the years they were behind, were mainly because of Massa.