hi
dedicated to the accordion ??? a priori the notes are the notes, the quarter notes of the quarter notes and an A m the same with all the instruments ;D (to be read with a smile)
if you are looking for transposition and if you have GP it does it very well
for the rest the answers will flow (I hope) with each one its advice because the choice is important and each one has its small habits.
Don't forget "Google" with a request for a score editor (possibly free), in any case you have the possibility to try the software in demo version, don't deprive yourself to see if you have the feeling for such or such
the best software is the one you know well and use all the time
personally, to wet myself a bit ;) I often use :
Note Worthy Composer (simple and user-friendly) for quick writing
Guitar Pro for what is dedicated to this instrument
and especially Harmony Assistant, which is not free but can do almost everything (import and export in many formats)
good search
JJ