If you're going to take in one adaptation of the story besides Hosoda's, I think I'd do best to recommend Obayashi's '83 movie first.
I've only seen about five minutes of it so this is mostly a rec of a movie I've not watched, but Obayashi's directorial style was an undeniable influence on certain of the '90s anime directorial school - Kon, Anno, and Ikuhara all owe a debt to his aesthetic/approach to filmmaking - and since Hosoda owes such a debt to Ikuhara in turn (fun fact: Utena was his first key animation job after years of inbetweener work, and the first credited scene to his pseudonym, IIRC, was ... the first sword duel between Juri and Utena! yeah), it's probably the richest in terms of connective tissue with the one you've already seen. And aside from the 2010 live-action film it's probably the easiest one that isn't Hosoda's version to obtain a copy of somehow.
no subject
I've only seen about five minutes of it so this is mostly a rec of a movie I've not watched, but Obayashi's directorial style was an undeniable influence on certain of the '90s anime directorial school - Kon, Anno, and Ikuhara all owe a debt to his aesthetic/approach to filmmaking - and since Hosoda owes such a debt to Ikuhara in turn (fun fact: Utena was his first key animation job after years of inbetweener work, and the first credited scene to his pseudonym, IIRC, was ... the first sword duel between Juri and Utena! yeah), it's probably the richest in terms of connective tissue with the one you've already seen. And aside from the 2010 live-action film it's probably the easiest one that isn't Hosoda's version to obtain a copy of somehow.