Of all the classic Tarzans that I have seen in cinema until 1984 (of which I only think I am missing a few, such as the blonde Denny Miller) Bruce Bennett (or Herman Brix, his real name) was my favorite. He did not have a great participation as "the king of the jungle", apart from the serial "The New Adventures of Tarzan", but, in addition to the fact that this version was closer to the creation of Edgar Rice Burroughs, who served as co-producer, Bennett was a handsome Tarzan, with a more serious face, a lonely and unglamorous hero, mistreated by the jungle, who I think I only perceived in Jock Mahoney and Christophe Lambert in 1984, when I stopped watching films with Burroughs' character.
I saw an edited version of the serial running 75 minutes and it seemed like a more than adequate adventure, with a less show business and more dramatic approach, and that leaves you wanting to see more, perhaps the entire serial. Other sources indicate 70 minutes. This version has not been restored. There is also a 59-minute British dubbed version that was aired on American television since the early 1950s, with 10 minutes of additional stock footage of the African flora and fauna. That material was later removed and the original was issued on VHS.
If you find a copy, see it, it's a well-represented Tarzan film.