I love the classic look of the Cali. Just wore it yesterday and fell in love all over again. You can rock in on an ammo and it's rugged; you can put it on a gator and it's pretty dressy. On the right day, it's my favorite watch.
The 448, however, makes the Cali a little less unique.
The 339 brownie wears on my wrist like a dream. The assolutamente strap is just perfect. It has a stealthy, almost mean look to it. The Brevettatto and MM insignia are awesome. The fears that some have (I have had no signs of any issues) keeps the 339 from going way up in price, so you can get one for a reasonable sum.
I know, I'm a big help. I think what it comes down to is which one you love more. I don't think you can go wrong.
Good luck with your decision.