A beginner's take on this topic (with enthusiastic agreement from his teacher who is pianist/PA player) - the big advantage of the CBA is the absence of any need to learn the kind of standardised fingering which the PA demands: each piece of music dictating where, when and how the fingers are placed.
The 3 row bayan does dictate a degree of formulaic playing, but when there are 5 rows available the "world is your oyster" so to speak.
Watch Galleano, then
alexandr hrustevich for examples of the player using the full gamut of options provided by the CBA layout.
Finding out by practice that I can improve my playing by incorporating the use of both thumb and 5th finger where and when they fit best is quite enlightening.
PS.
stijn82 - in case you have not seen my previous posts, I am a raw beginner who bought myself an accordion for my 80th birthday last year.
I have learned heaps and heaps about music and about myself in the last 12 months!
Lots of it from the good folk contributing their expertise and knowledge freely on this forum.
Great that you're having a good time and learning a lot!
Yes it is true that both CBA systems allow for a 'free' fingering and using of the 5 rows, which is great, so in many respects those systems are very similar and offer an advantage over the PA!
though I don't completely agree with the general assumption that B system and C system are totally equal in their possibilities.
I'm 40 years old and just finished my bachelor degree at conservatory, with a lot of struggles, but I made it. The last 10 years I have seen so many things, and many great young players. Players of 16 year old that did totally amazing things on C system - which means they didn't have the time yet to practice for 10.000 hours to get to that level - so the fact they had a good teacher which also play the C system helped, and the system self didn't seem to impose any limitation.
There never has been done any scientific research on which system is the best, like in which requires less hours of practice, stronger fingers, more or less movement with the wrist, etc...
so I tried to find out if there is any difference, even a very small one... that can be significant if you want to reach the top level.
I tried to figure out whether composers did take any difference into account - do the russian composers compose for B system? do the french composers write for C system? and what about composers that don't play the accordion, or pieces that were written for piano/harpsichord?
I was a bit surprised by my own conclusion: it seems that music that has not been written for a specific system, seems to be a little easier on the C system. Some others have already mentioned that C system seems to be more suitable for diatonic runs and B system seems more suitable for chromatic runs - see for instance
https://nydana.se/accordion.html#cbacvscbab ... but in fact almost all music is diatonic by nature! (and with music that has no tonal structure at all, there is no difference between the systems...). Another thing you could try out on C system is the following: try to play C-D-E-F-G with 1-2-3-4-5, then D-E-F-G-A, E-F-G-A-B ... etc.. using all the 5 rows if needed! it turns out that it is always possible, and that the fingers 1, 4 and 5 are almost always in the same comfortable position (C-F-G, D-G-A, E-A-B).. and then you have to put the 2rd and the 3rd finger on the correct note depending on where the semi-tone interval is (E-F)... this is always comfortable too and gives you maximal possibilities to use all the 5 rows and 5 fingers.
On the other hand, I know many B system players that don't use the 4th and 5th row.. and they get stuck at some level. If you play C-D-E with 2-3-4 ..would you use the 4th row to play the D? It doesn't give a real advantage, because D-E requires a spread of your fingers.
So...
traditional French composers (like Andre Astier) -> good playable on C system, but harder on B system.
traditional Russian composers (like Zolotarev, Semyonov) -> good playable on B system, but C system also works well...
modern accordeon composers -> in my opinion a bit easier on C system... because C system is good for diatonic runs (see my fingering for the scales, as well as for (broken) chords)
We all know that Alexandr Hrustevich and other russian/ukrainian players are great... but I have a bit the idea that the russian players also pick the repertoire that suits them...
When I look at the french repertoire, it seems to have lot of harmony in it... which makes the music also very beautiful.
I like for instance Divertimento by Andre Astier... I am studying it, but seems to be harder on B system as well.
look at this talented girl.. she does a really amazing job on B system! Using all 5 rows... but still not very comfortable I would say.
Then look at Christine Rossi, same piece on C system... like even a bit faster and with more ease.
to be honest I think she is better than the russian players... I saw this concert live in Castelfidardo. very special moment, where also Jacques Mornet (her teacher) was present and came on the stage..
and if you think russian music is hard on C system:
another talented player on C system:
or some classical on C system:
In ‘The Goldberg Variations’ gaan dansers Oskar Stalpaert (Platform-K), Michiel Vandevelde en Audrey Merilus aan de slag met de composities van Bach en de im...
www.youtube.com
So.. though nothing of what I say is scientifically proven, I think I can recommend C system to any player as it seems everything is possible on it...