My what a lot of interest your question has caused!!

In my humble view as an elderly semi professional musician I think that all the three main systems are really good and useful. They each have their strengths and weaknesses. Don't be put off as you can play most things on most types. Just try them all if you can. Prices for instruments are ridiculously high and much snobbery exists in the concertina world. The cheaper italian anglo's can sound great in the hands of a good player and a fine Jeffries anglo can sound squeaky and bad when played by a poor player. Many years ago I was ashamed of a tattered old Hohner concertina I had at a workshop, it was the only thing I could afford at that time. During one of the tuition sessions I bemoaned the fact until Alistair Anderson picked it up and played it. It sounded fantastic! best wishes stevethesqueeze