I've never been fortunate enough to have my hands on either - nor even heard one 'live', so to speak, only recordings.
So, I really have no experience to go on..
My dad is going to build one (since there's no way I can afford the entry price!)
We have construction plans for the grande bouche - but also plenty of information about the build requirements for the petite bouche too..
Though I'm of course inspired by Django and sorely tempted to go in the direction of a 503 replica, I do wonder if that's wise since my main use for the guitar would likely be in an accompaniment capacity - playing rhythm in a guitar/clarinet duo.
Mainly, I want the guitar to be LOUD - to match the clarinet without the need for amplification.
Plus, I have relatively small hands so perhaps the shorter scale length of the grande bouche makes more sense??
I reach out to the brothers on this forum for sage advice!!
Many thanks :) :)