I keep flipping back and forth between the Tradi and the Contemporaine...
I love the simple look of both watches, and I love the fact that they both have no date window (I think for a time only model the pure, clean dial look works better). In terms of specific pros and cons...
1) I really like the fact that the Contemporaine is a very classic style, but with a modern twist. I believe that for the majority of people, this will look like a very classical watch, but the few connaisseurs will be able to appreciate its originality, and I like that very much (when I showed my wife and told her I though that the watch had a modern edge to it, she looked a me as if I should be send to the nuthouse).
2) I have no problem, and actually love the case's dimensions. Its proportions do make the watch seem a little bit bigger than its actual 40mm, but when I tried it on I thought that it went perfectly well on my wrist. And I really like how thin the watch is, it's a big plus in my book.
1) I am in love with the caliber 4400 - being able to look at it a few times a day would be such a privilege.
2) I love the fact that the seconds dial is at 6 o'clock (as opposed to the other version, which is a 9)
3) I love the masculine and strong look of the watch.
You can't go wrong in both cases. Comparing them, I would say that the C. is more refined, delicate and original, while the T. is more sturdy, traditional and timeless...
Given the fact that you already have an Excellence Platine Malte Chrono, I would advise you to get a Contemporaine, which is more of a departure from the Malte Chrono than the Traditionelle, and might "balance out" your VC collection better.
Good luck in your choice!