I love these discussions. Guido is one of the reasons I am playing a baritone/euphonium. I use the slash designation because though Conn called it a baritone, it looks and sounds more like a euphonium. Mine is a 1935 Conn 64I. When I started playing this horn, I had plenty of experience playing trumpet and french horn. I asked Guido for advice but didn't want to spend the big bucks. I got this horn really cheap and the fact it is a small bore, I thought it would be easier coming off small horns. I now have five mouthpieces to experiment with. That includes a very old Conn that was made for the instrument. As I've developed my playing abilities, my sound has changed as well as how much I can handle. Where once the Wick SM9B was too difficult to play well, it has come to be my favorite sound. That combination gives a large, warm sound that is consistent over the full range of the horn. It is more work. So I would suggest working with whichever combination gives you the best sound at that time, but don't forget to try others as you develop as a player.