Hi,

Are you able to try different models - to see what feels comfortable ?

I chose english because I don't like the diatonic (different notes push & pull ) nature of anglos, but having chord buttons would be useful !

Price might be a factor for you, unfortunately they are not cheap instruments.

Are you able to get to a festival or dealer to try out the diferent kinds ? Or maybe a concertina group - though you may start a civil war about the merits of the anglo v english etc.

.... duets have too many buttons for my taste, though they can sound great.

How about listening to some of the really good players - see if there is a style you would like to go with & needs a particular kind of concertina.

I do know people who play both anglo & english, but not many - it does seem sensible to weigh the pros & cons before putting the time ( & money in ).

On other factor - individual concertinas can have very different sound qualities - you may one you particularly love the sound of, & nevermind the science bits.

Good luck

Jim