Whats the best book copy of the play “Julius Caesar”?
The best scholarly editions of individual Shakespeare plays are the Arden ones. They’d have the best notes, but many of them involve disputes over textual accuracy rather than literary interpretation. Still, they are heavenly for the Shakespeare lover. They are, though, too large for your purposes. For good solid texts with good notes and prefaces or afterwords, the Signet Classics editions are fine. However, some would find fault with the paper for an actor. But I suggest you use the Signets as your guide and pick out something that has better quality paper and larger margins with equally good (if not better) critical apparatus outside the text of the play (e.g., a preface or whatnot). Good luck!