Tivadar Szántó was a notable pianist and contemporary of Busoni, and his works often lean toward a sophisticated, late-Romantic harmonic vocabulary. This piece is a contemplative and expansive look at the ballade form.
The main difficulty is managing the sustain and resonance required for the atmospheric, larger-than-life sonorities.
Comparable difficulty and character — good candidates for what to learn next.
Ballade (Op.2) is rated Henle level 7 of 9 — late advanced repertoire, roughly ABRSM grade 8 and above. In the RCM system it corresponds to about level 9.
You should be comfortable at Henle level 7 — meaning you can already play level 6–7 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
A typical performance of Ballade (Op.2) lasts about 8 minutes.
Ballade (Op.2) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.
Pieces at a comparable difficulty and character include 'Bella mia fiamma' by Wolfgang Amadeus Mozart, Ballade No.2 by Frédéric Chopin, Asturias (Leyenda) by Isaac Albéniz — see the full similar-pieces list on this page.