The original animated stuff is good, but the manga is the real source material and it's pretty wild.
Man, old manga is pretty hardcore. Naked girls everywhere, main characters who are real dicks, and violent in a way you wouldn't expect retro manga to be.
Devilman was hentai lite. Can't say that I really liked it all that much. Tbh, Netflix has godtier production values but they have a bad choice in source material.