Best for mostPenguin (Nestor) · 2003
The Penguin Classics edition is the one I'd start with — Pauline Nestor's introduction and notes make a famously disorienting novel (two narrators, two generations, a tangle of names) easier to hold, in a readable, cheap paperback. This is where I'd start.
Best for studentsNorton Critical (5th ed.) · 2019
The Norton Critical Edition gives you the authoritative 1847 text plus contemporary reviews, criticism, and context — the study edition, recently updated. More than a casual reader needs.
Scholarly alternativeOxford World's Classics · 2009
Oxford World's Classics is the scholarly alternative, with a detailed introduction and endnotes. A solid choice if you want depth on Brontë's themes and the novel's structure.
Emily BrontëWuthering Heightstr. Free (public domain)
FreeFree (public domain) · 1847
Wuthering Heights is public domain and free. Free and complete — but a family tree and a few notes really help here, which the print editions provide.