Of course there are people who are brand loyal. But not everyone is that… fortunately. Otherwise there would be little competition, which would be detrimental to consumers. This may be based on an emotional or rational consideration. People will often choose, with the head or the heart, on the basis of a consideration that is most satisfactory to them. That is why it is sometimes difficult to discuss this, especially if one wants to convince the other person of his/her choice. With regard to, for example, a keyboard choice: it is very personal and often people do not know/hardly know why someone comes to that choice. That is not necessary and adds little. Treat each other with respect with the choice someone has made.
Where people generally talk about brand X or brand Y, it is of course best to discuss it on the basis of available data. That in itself is also quite fun and interesting. After all, making music is of course the icing on the cake, with whatever brand