I've never seen someone successfuly argue why this is better than Pierre or The Confidence Man, other than more people have exposure towards it. Also, I disagree with almost all of your picks. I presume you mean novel and are discounting epic poems, so:
Have very little exposure, Probably Virgin Soil
IDK something from Balzac or Flaubert, maybe Hugo or Stendhal. Or Rabelais if that counts. Maybe Rousseau. Celine is worth mentioning.
Confidence Man, maybe Marble Faun. My top 10 would be those 2s novels. I'll exclude Henry James. Cooper, London, Burroughs, late Faulkner, Chandler, Nabokov, Lovecraft, and oddly Kerouac worth mentioning I guess.
1. Confidence Man
3. Marble Faun
5. Moby Dick
6. Green Gables
7. Israel Potter
8. Scarlet Letter
10. White Jacket
Probably one of the Stoker ones
Arcadia from Sidney, I am guessing doesn't count.
Probably a Thackeray one. Henry James, the Swinburne novel, Walter Scott, Fielding, maybe Conrad, maybe Wells, Ford Madox Ford, John Henry Newman, Dickens, Defoe, MP Shiel, Carlyle, Thomas Hardy, Carroll, Lord Dunsany, Disraeli, Burgess.
I'd probably pick the Swinburne one in all honesty.
Definitely Goethe: Wilhelm Meister 1 and 2, Elective Affinities.