>>126822233
Objectively speaking, this is how the ranking goes:

Rach 2 = > Brahms 2 = Rach 3 = Schumann = Mozart 23 > Prokofiev 2, 3 > Mozart 20 > Mozart 24 > Chopin 1 > Rach 1 > Mozart 21, 25 > Rach 4

Honorable mentions: Grieg's, Beethoven's 5 and Tchaikovsky's 1st, Brahms 1, Ravel's, Bartok's 3

There are more, very good ones in fact, but they're all below the above. Except Saint-Saens', I feel those can rank quite high but I still have to get into them properly.

Piano concerto is the greatest genre.