What the hell does it matter who made a concertina.

No such thing as a favourite. I have several very good boxes and they are all very different characters. I play all of them regularly according to my mood and the type of music I wish to play at the time.

Don't go blindly for some famed makers name.
If you are buying a box, try as many as you can, shut your eyes, open your ears and let it speak to you. If it plays and feels right for you, then it is right.