when it comes to playing Irish music, and executing ornamentation, all three systems have much to offer.
the layout of the crane duet maakes it possible to use a lot of fiddle ornamentation without great difficulty [five note fiddle rolls],four note twiddles[ga gg]octaving and drones[ likewise the English]the 30 key anglo can do 90 per cent of this, but has to be conscious of directions to acquire smoothness[ if thats what is wanted]
    30 or 40 years ago the english concertina was a little more common in Ireland than people imagine.Madeline O dowd won an all Ireland on an english , and members of Junior crehans family played the English. often it was a case of what concertinas people could get hold of, and then playing ,enjoying and developing ones own style.
I still think its important to do that which comes naturally on an instrument, for example octaving on an english is relatively easy, for example the note e, however try octaving an [e] on the violin it requires , jumping a string or using the little finger, considerably more difficult on the violin.
   However a lot of cross fingering techniques,four gs [two semi quavers two quavers in 6 /8 time]are easy on all systems providing your not getting your fingers out of positionfor the ensuing notes.[ probably easiest on a duet where you have an overlap of eight unison note left and right]and then the anglo where you have two notes g and a which are overlapped.Dick Miles