Best for mostFolger Shakespeare Library · 1993
For almost everyone, the Folger is the right Midsummer Night's Dream — facing-page glosses keep the wordplay and the fairy mischief clear, with scene-by-scene synopses. Cheap, and the classroom standard. This is where I'd start.
Most scholarlyArden (3rd series) · 2017
The Arden Third Series is the scholar's Dream — a long introduction and dense footnotes on the text, its sources, and its stage history. Indispensable for study; more than a first read needs.
For beginnersNo Fear Shakespeare · 2003
No Fear sets the original beside a plain modern paraphrase — a crutch, not the poetry, but a way through if the language has stopped you before. (This is one of the more approachable plays to begin with.)
William ShakespeareA Midsummer Night's Dreamtr. Free (public domain)
FreeFree (public domain) · 1600
A Midsummer Night's Dream is public domain, so the full text is free — Folger Digital Texts, MIT, Gutenberg. No glosses, but the whole play at no cost.