One of that opinions was said by TubaTinker:
I find this very interesting. On one hand, it is much easier for the composer to write in Real Tone (C) and lets the tuba player choose the best tuba for the job. on the other hand we have to deal with different fingerings, some ambiguous writings (difficult to choose the type of tuba for exemple), and, in most cases the music for tuba fits better in the staff when in trebble cleff.I vote a firm NO!!!!... American composers, anyway. They either don't know or simply don't care that tubas come in many keys... and WE'RE the ones who have to contend with all the different fingerings! Otherwise, they would be writing transposed tuba parts in the treble clef like some of the older parts of the World.
Another thing: who should choose the tuba? the player or the composer?
I'd apreciate some discussion about this.