Bits:
opening: Rach 2, runner-up: Beethoven 5, h.m.: Saint-Saëns 2 and Tchaikovsky 1
cadenza: Prokofiev 2 and Rach 3 "chordal", runners-up: Rach 3 "light" and Rach 4
ending: Scriabin and Grieg
Movements:
first: Prokofiev 2 and Rach 3, runners-up: Scriabin, Rach 4*, Beethoven 5, Rach 2, Brahms 2, h.m.: Tcherepnin 5
slow: Rach 2, runners-up: Scriabin, Tveitt 5, Rach 4*, Beethoven 5, h.m.: Mozart 27, Brahms 1
last: Rach 3, runner-up: Scriabin, h.m.: Rach 4*, Beethoven 5
Overall:
Most beautiful: Scriabin
Most emotional: Rach 2
Most interesting: Rach 4*
Most compelling technically: Rach 3, runner-up: Prokofiev 2
Best "major key": Beethoven 5, Beethoven 4
Best baroque: Bach in d
Best post-Bach pre-Beethoven: Mozart 27, runner-up: Mozart 9
Best post 1950: Tcherepnin 5
Best obscure concerto not yet mentioned: Tveitt 1
*original version or 1927 version, not the final "revision"
note: I don't have much experience with Beethoven's 4th. I've heard it a few times, and I've enjoyed it, but it hasn't grabbed me on a deep level. Performances can make and break pieces, so I hope to get more recordings. I also haven't yet heard Tcherepnin's 4th concerto, which some have said is his best work in that genre.