I had a small Campana, but I let it go as I didn't enyoy it - too bulky under the arm, yet not enough room for my usual stuff. Somehow it didn't seem as soft as my other BV's - maybe I was not patient enough with it.
Recently I got my first Bella bag, pre-loved. And I love it! It fits better, has more room, and even though it also has the magnetic closure thing, it just seems better/safer.
In conclusion: I like the Bella better. In fairness, though, I should mention, that the Campana was a white/grey color which I always felt I had to be careful with, whereas the Bella is red, and therefore not as delicate. But while I would love another Bella, I am not getting a small Campana again, even as it is awfully pretty to look at....