The problem is, not being a young pup, I don't think I can play every composer well so I'm trying to limit myself to a few that I do decently rather than scattering my focus among many and do them all poorly. So it will always be ' Chopin.... and a few friends' even if some of this friends are more than 100 years younger than he.
Being disciplined and limiting myself is a problem for me. When comes to practicing and performance it is a good point to stick to a limited number of composers. After having studied a few of Grieg's lyric pieces it is easier to learn more Grieg than music written by other composers using different means of expression. So although I could say that almost all great composers are favorites of mine, there are a few I play much more than others. My "short" list includes:
The reason for this is that I have gained sufficient understanding of their music to be able to work with it on my own. And with the exception of Faure, these composers have written lots of relatively short pieces that are playable, even by an amateur. I have spent some time with barcarolles and nocturnes of Faure - pretty hard for me - and now I'm working on some of his songs (Chansons) together with a vocalist, and these count as "short" and "relatively easy" for me.
I have omitted important names like Mozart, Beethoven, Schubert, Schumann, Debussy etc from my short list, simply because I don't play so much of their music. I should also mention that among composers that I could count among my "favorites" are Verdi, SchÃ¶nberg, Schostakovich, Prokoffieff, Rachmaninoff, Mahler and many more. It is just impossible for me to say whose music I value the most. I need them all.