Interestingly Russian composers seem to be born orchestrators. Take some of the symphonies of Borodine, Kallinikov, Rimsky-Korsakov, Glazunov ,Tchaikovsky, Lyapunov....
…… and all the 6 symphonies by Anton Rubinstein…… although these are not as good as the heavenly 4 Brahms’s masterpieces……

Back to more serious talk. In my opinion the symphony is the most complete musical expression, followed by the concerto for one (or more) solo instruments and orchestra. However, listening to a symphony by Rufinatscha gives me a happy feeling, but after the coda of Tchaikovski’s
Pathétique I’m not in a joyous mood, although I find this one of the greatest symphonies ever written. Some music lovers think that the string quartet is the most intimate musical form, and I can go along with that. If I had a tough working day, with a lot of people keeping me busy, and I get home and want to relax, I love to listen to smooth piano music, and Xaver Scharwenka can be my choice. If I want to get into a sad mood (don’t ask me why), I might listen to Strauss’s
Vier letzte Lieder (I’d better say, these songs, especially
Im Abendrot, make me sad). If I’m busy at home, but like to listen to easy classical background music, it can be short piano pieces by Heller. In wintertime, sitting near the fire with a nice bottle of bordeaux, I love chamber music e.g. Raff’s piano trios. Dreaming away is good possible while listening to something like the
Siegfried-Idyll. A piano concerto like the Henselt certainly keeps me awake. So it also depends on the situation.
Summa summarum, like Alan says, “great music is great music, whatever form it takes”. And I fully agree on that. No art influences my mood more than music.