Mechanical pencils: Pentel Smash or Pentel Graphgear 500?

The Pentel Smash mechanical pencil is usually compared to the Pentel Graphgear 1000, but I'd like to ask you comparing Smash to Graphgear 500.

Where I live, both are expensive mechanical pencils, but Smash is 70% more expensive and, IIUC, more professional. I'd like to know whether it pays to choose Smash over Graphgear 500 or both are kind of similar so I should go to Graphgear 500.

Do you know them? How do you compare both?

Thanks!