Yes (I suppose to repeat), mostly:
This
The reason that British-style euphoniums and American and German-style tubas took off and started getting used in orchestras and bands around the world is that they turned out to be just plain better instruments than the other regional variations.
and this:
Most specifically, with the contrabass tubas, the breadth of the fundamental and strength of the overtones can't be matched by a French tuba in C or euphonium playing the same pitch.
In short, it can make the pitch, but it can't make the sound.
Also, it's French.
Gary Merrill
Wessex EEb Bass tuba (DW 3XL or 2XL)
Mack Brass Compensating Euph (DE N106, Euph J, J9 euph)
Amati Oval Euph (DE 104, Euph J, J6 euph)
1924 Buescher 3-valve Eb tuba (with std US receiver), Kelly 25
Schiller American Heritage 7B clone bass trombone (DE LB K/K10/112/14 Lexan, Brass Ark MV50R)
1947 Olds "Standard" trombone (Olds #3)