2 visions of automatic movements, annual calendar and chrono versus perpetual calendar, the size, the legibility...
Both are great on the wrist, but one is more discrete, while the other ( 5960P) will maybe be easier to wear.
I'd go for the perpetual calendar:
Because it is, in my opinion ( and I know that many will have a different opinion on tis matter ) more interesting than an annual calendar, this last one being a compromise between the full calendar and the perpetual calendar.
Because its smaller size is very elegant.
Because I'm a sucker for the Cal 240.
One con, though: Its price, which is much less " interesting " than the 5960P.
Best,
Nicolas