Clearly it's all down to personal taste, but to add my suggestions to
those already made (every one of which I agree with!), some of my
favourite classical material on Duo-Art is:

6365 Chopin's Andante Spianato & Polonaise, played by Alfred Cortot

6441 Schubert's Rosamonde Impromptu, played by Alfred Cortot

5953/5963/5973 Saint-Saens' Second Piano Concerto, Op. 22, played by
    Harold Bauer

7001 Rimsky-Korsakov's Sheherazade Fantasia, played by Prokofieff

6125 Rachmaninoff's Prelude, Op. 23, no. 5, played by Prokofieff (who,
    I think, makes more of the lovely slow central section than does
    Hofmann’s version on 6229)

7378 Liszt's Cantique d'Amour, played by Rudolph Ganz

6694 Schubert/Liszt's Hark! Hark! The Lark!, played by Paderewski

6592 Strauss/Schulz-Evler's Concert Arabesques On "The Blue Danube,"
    played by Leginska

There are vast numbers of other utterly superb rolls, of all styles of
classical music, both earlier and later than the types listed.

If you want a totally different list, look at my catalogue of recut
Duo-Art rolls on my website (www.pianorolls.co.uk).  None of the above
are featured (yet), but instead there's a selection of pieces that
either I have been asked to recut (so somebody likes or wants them) or
rolls that I've come across that particularly appeal to me.  Of the
latter, the "Gaertner Waltzes" played by Ignaz Friedman, Grainger's
sublime transcription of Richard Strauss's "Rosenkavalier" love duet,
and "Procession Of The Sardar" are particular favourites.

Julian Dyer