I have the small misono cleaver. It was my main knife for more than one year and a half and my first high end cleaver. It is thin, with very good steel and is not difficult to put a good edge on it. I was very happy with it at that time. Then I started buying full size cleavers and soon got used to that size, which I prefer now. So the misono gets almost no use at all these days.
I think it depends on what you get used to, I would say try different sizes and find out which one you like most. I would repair the cck if possible and try to use it for a while before buying a new one