All the BBb tubas I've ever played have very serious intonation problems that are not always easy to fix, F just below the staff is always quite sharp (but that can be fixed by using 4th valve but most begging tubists don't know that), Ab in the first space is also very sharp, and Eb one partial below that is flat (these are of course only on the tuba I used before I switched to C). CC tubas of course have intonation problems as well, but for whatever reason intonation has become so much easier for me to fix since I've switched to C.
Also, since BBb tubas are lower pitched than CC tubas the sound is a lot broader than C tubas, not necessarily a bad thing and likely appropriate in certain situations but it wasn't the sound that I found most appealing, and it seems that someone important must agree with me as C tubas are the norm for most serious players.
But really if everyone in the section has an instrument in the same key everyone would an easier time with intonation I think! Especially in a concert band section.
Davis



