I know it's strange to pick the Geneon/Pioneer logo over the Gold Bar, but I'd actually rather see the Geneon logo on more of the Lupin releases than the Gold Bar. Actually, I'd rather see it half and half.
I can imagine Island of Assassins with it's darker, dramatic storyline having the Gold Bar, along with Voyage to Danger, Missed by a Dollar, and Dead or Alive. But all of the late 80s early 90s specials, including Mamo (of course), the live action movie from 74, Pursuit of Harimao's Treasure, Dragon of Doom, and a lot of the more recent specials actually feel more deserving of a more comedic and epic logo like Geneon's rather than just a gold name plate.
I'm not really all that zealous about pushing this opinion, this is just how I passingly feel about it. The gold bar has been fine on everything it has been printed on, but to see the other logo on select titles just seems more fitting.
Although, I do think some of the other Lupin titles wouldn't look too bad sporting the Cagliostro knife stabbing a note logo. That's been on more than a few things in Japan if I'm not mistaken.