Better at what? Having people write (Jeordie, Trent, Gacy, Berkowitz) produce (Trent) and design (Floria Sigismundi among others) stuff for him? Totally.
I can agree that MM's image became more iconic than Trent's, but Trent never really catered towards the celebrity game. The term "better" alone says nothing and feels irrelevant since they weren't aiming at achieving the same goal.
Had you said MM was bigger than Trent, then yes. He was.
I haven't engaged in a mm vs. nin conversation since the 90's and hope I won't for another ten years.