No, not for me.
Having owned both I would say you need final poll choice: Someday will own both preferably at the same time
My 348 loud raw racing car for the road is a keeper - but a 456 GTA would be a great foil. I used to have a JaguarSport XJRS 6.0 litre V12 - I'd like another V12 but in addition to the 348.
I love the wide back end of the TestaRossa. I would have bought that prior to the 355. Now, lack of space keeps me from buying one.