I'm italian and I know very well italian romantic organ repertoire(music by Bossi, Ravanello...).
This music was played on italian romantic organs.
People from other country think that in Italy there are very small and ancient instruments.
Instead in Italy most of the organs are big romantic instruments made by Tamburini, Vegezzi-Bossi, Mascioni, Ruffatti....
These instruments are based on the Ripieno(the Italian mixtur, very different from german, english or french mixtur, in fact it'is very bright) with lots of ranks.
There are also so beautiful foundations and anches; for me they are the better organs in the world!
So, the better instrument to play this repertoire on Hauptwerk, for me, it's Caen, the most close organ to italian instruments.