What is better for autographs on a card? Pen or Sharpie

[Exhibitman]

I prefer the sharpie-type implement for modern signatures. Ballpoint pen isn't a great ink, especially vintage ballpoint. There is a significant fading problem even with appropriate light handling, and if you display, forget it. I had a nice Ryan-signed baseball that faded so far so fast that I had to take it down after a very short time. Sharpies aren't colorfast either but they seem to do a lot better when exposed to light than ballpoint does. Pencil doesn't look great but it seems to last forever--the pencing writing on the Exhibits I have is as sharp as the day the stupid kids scribbled it.