Ive seen and felt the Accossato in person and although it does look high quality and feels good, when it comes to things like this I go with the originator. Just look at the Accossato and its clear its direct copy of the Brembo....
The Brembo I can vouch for 100% I had a 19x20 from 2001 that I used to move to every bike I owned, after having it on 3 different bike I eventually sold it to a friend. And he is still using it to this day...10 years in use on multiple bikes and never one rebuild.
Ive had the 19x20 in forged and now I have the billet, you cant go wrong with these levers with good fresh racing fluid they never fade...
If Im not buying a Brembo Id go for a Magura, but only the billet ones....